Boston Red Sox vs Toronto Blue Jays Prediction Market Odds, August 13, 2026
| Spread | Total | ML | Best ML | |
|---|---|---|---|---|
â–¶Sox | -1.5 47%47% | O 1 46%46% | 61%61% | 61% Kalshi |
â–¶Jays | +1.5 53%53% | U 1 54%54% | 41%40% | 41% Kalshi |
Boston is the 61c road favorite over Toronto in the series finale, and this line has now swung hard for four consecutive days: 62c on August 10, 43c on August 11, 54c on August 12, and 61c today. That is a 19c reversal followed by an 18c reversal back. Kalshi and Polymarket both print Boston at 61c and Toronto at 40c, so the two books are exactly aligned. The swing is a pitching artifact rather than a verdict on either club. Boston (64-56) hands the ball to Payton Tolle (7-6, 3.20 ERA) against Max Scherzer (1-4, 7.25 ERA), the widest starter-ERA gap of the series, while Toronto (59-63) has already taken the first three games.
Toronto has won this series 2-1, 5-3, and 6-4, Boston has lost five straight, and the market still makes Boston the 61c favorite for the finale. That combination looks contradictory until the rotation card is read alongside it. Every price in this four-game set has tracked the starting pitchers almost exactly, and the August 13, 2026 matchup gives Boston the largest ERA advantage it has had all week. First pitch is 3:07 pm ET at Rogers Centre.
Red Sox vs Blue Jays Market Context
The daily arc is the story. On August 10 Boston opened the series as a 62c favorite behind Sonny Gray (14-3, 2.79 ERA) against Jameson Taillon (2-6, 5.68 ERA), and lost 2-1. On August 11 the market flipped Boston to a 43c underdog with Patrick Sandoval (1-1, 3.30 ERA) drawing Dylan Cease (7-5, 2.40 ERA), and Boston lost 5-3. On August 12 the two starters were nearly identical, Ranger Suarez (4-3, 3.25 ERA) against Jose Soriano (9-6, 3.16 ERA), and the line landed at a near-neutral 54c before Toronto won 6-4. Today the gap reopens in Boston's favor and the number reopens with it at 61c.
Read as a series, the moneyline has not been whipsawing on team quality at all. It has been repricing a single variable four times in four days. That is worth knowing before treating today's 61c as a market that keeps changing its mind about Boston.
The records underneath support the road favorite. Boston is 64-56 and 35-25 away from Fenway Park, one of the better road marks in the American League, and sits third in the AL East behind Tampa Bay (74-46) and the New York Yankees (68-52). Toronto is 59-63 and an even 31-31 at home, 16 games back in the division. The Blue Jays hub and the Red Sox hub carry the season-long futures context for both clubs.
Red Sox vs Blue Jays Pitching Matchup
Payton Tolle takes the ball for Boston at 7-6 with a 3.20 ERA. Max Scherzer starts for Toronto at 1-4 with a 7.25 ERA. That is a 4.05-run gap in earned run average between the two starters, more than double the separation in any of the previous three games of this series, and it is the single cleanest explanation for why a team on a five-game losing streak is priced at 61c on the road.
The run-line market prices the same read with more caution. Boston at -1.5 trades at 47c on both Kalshi and Polymarket, meaning the market gives Boston roughly a coin flip to win by two or more. Toronto at -1.5 sits at 25c. The full-game total sits at 51.5c average for Over 7.5 runs (52c Kalshi, 51c Polymarket), the closest thing to a true toss-up on this board, and Over 8.5 drops to 44c. The first-five-innings market has Boston at 51c to lead after five with Toronto at 32c and a tie at 16c, which is a tighter spread than the full-game moneyline and reflects how much of Boston's edge here is concentrated in the bullpen phase after Scherzer exits.
Both books agree on essentially every core line, inside 1c on the moneyline, the total, and the run line. There is no cross-platform pricing disagreement to point at on this board, which is itself useful information: two independent order books arrived at the same number for a favorite whose team has lost five in a row.
When the Red Sox vs Blue Jays Market Resolves
The moneyline resolves to the winner of the game at Rogers Centre on August 13, 2026, scheduled for 3:07 pm ET. Kalshi and Polymarket both settle once the game is official and final, generally within hours of the last out. The run line settles on the final margin, the total settles on combined runs scored by both teams, and the first-five-innings markets settle on the score after five completed innings.
Key Red Sox vs Blue Jays Catalysts
Starter gap: Payton Tolle (3.20 ERA) against Max Scherzer (7.25 ERA) is a 4.05-run ERA separation and the largest of the four-game set.
Series form against the price: Toronto has won three straight in this series by scores of 2-1, 5-3, and 6-4 while Boston has dropped five consecutive games overall.
The four-day arc: 62c, 43c, 54c, 61c across the series, a movement pattern that has tracked the rotation card rather than results.
Book agreement: Kalshi and Polymarket sit within 1c on the moneyline, the total, and the run line, so there is no pricing gap to exploit here.
Home and road splits: Boston is 35-25 on the road, Toronto is 31-31 at Rogers Centre, a rare case where the visitor holds the better venue record.
Standings stake: Boston is 10 games back of Tampa Bay in the AL East and needs road wins in August to hold its wild-card position; Toronto is 16 back and playing spoiler.
Related Red Sox vs Blue Jays Markets
The two earlier games of this series are still live on the site and show the same pattern from the other side: the August 12 game board priced Boston near even at 54c with two matched starters, and the August 10 opener had Boston at 62c behind Sonny Gray. For season-level context, the MLB hub tracks division, pennant, and World Series pricing across both platforms, and the Red Sox team page carries Boston's futures board alongside its remaining schedule.
Resolution Criteria
Resolves to the team that wins the game between the Boston Red Sox and the Toronto Blue Jays at Rogers Centre in Toronto on August 13, 2026, with a scheduled first pitch of 3:07 pm ET. Each team contract pays $1 per share if that team wins and $0 if it loses. The run-line markets settle on the final margin of victory, the full-game total settles on combined runs scored by both teams, and the first-five-innings markets settle on the score after five completed innings. Kalshi and Polymarket both settle once the game is official and final, typically within hours of the last out. If the game is postponed or suspended, each platform applies its own rules: a game moved to a later date is generally carried over or voided per platform terms, and a shortened game that is declared official settles on the score at the point of stoppage.
Key Factors
- Payton Tolle (7-6, 3.20 ERA) vs Max Scherzer (1-4, 7.25 ERA), a 4.05-run ERA gap and the widest of the series
- Toronto has won the first three games 2-1, 5-3 and 6-4 while Boston has lost five straight
- The moneyline has moved 62c, 43c, 54c and 61c across the four series games, tracking the starters not the results
- Kalshi and Polymarket agree within 1c on the moneyline, the total and the run line, so no cross-platform gap exists here
- Boston is 35-25 on the road, Toronto is 31-31 at Rogers Centre
- Boston sits 10 games back of Tampa Bay (74-46) in the AL East with wild-card position at stake
What are the current Red Sox vs Blue Jays odds?
As of August 13, 2026, Boston is the 61c road favorite and Toronto is at 40c. Kalshi and Polymarket both print 61c on Boston, an exact match between the two books.
Who is favored in Red Sox vs Blue Jays on August 13, 2026?
Boston is favored at 61c, roughly a 61% implied probability, despite having lost the first three games of the series. The pricing follows the starting pitching matchup of Payton Tolle (3.20 ERA) against Max Scherzer (7.25 ERA).
Why has the Red Sox vs Blue Jays line moved so much this week?
The moneyline has gone 62c, 43c, 54c and 61c on Boston across the four games of this series. Each move lines up with the starting pitcher matchup for that day rather than with team form or the series results.
Where can I trade the Red Sox vs Blue Jays market?
Both Kalshi and Polymarket list this game. Kalshi carries the deeper set of alternate lines including team totals and first-five-innings spreads, while Polymarket carries the winning-after-five market at 51c on Boston.
What are the Red Sox vs Blue Jays spread and total?
Boston at -1.5 on the run line trades at 47c on both books and Toronto at -1.5 sits at 25c. Over 7.5 runs averages 51.5c (52c Kalshi, 51c Polymarket) and Over 8.5 runs drops to 44c.
What should I watch before this market resolves on August 13, 2026?
Watch whether Max Scherzer holds his command early, since Toronto has scored 13 runs over the first three games of the series. The first-five-innings market at 51c on Boston is the cleanest read on how much of the Boston edge the market places before the bullpens take over.