I sat in a press box in 2023 watching a third-inning bullpen warmup that took longer than the first two innings combined, and I remember thinking the pitch clock would not actually change anything because baseball had absorbed every previous reform attempt. I was wrong. By 2025, the average MLB game finished in 2 hours 38 minutes, and games over three and a half hours had effectively disappeared from the schedule. Three games crossed that threshold across the entire 2025 season, compared to 391 in 2021.
What that means for a UK punter is that the totals market has been quietly remade by a structural change the recreational money has not fully digested. The pitch clock is the most consequential rule change MLB has made in my working lifetime as a bettor, and the effects on pricing, props and bullpen markets are still working their way through.
What the Pitch Clock Changed (2023-2025)
The pitch clock arrived in 2023 as a 15-second timer between pitches with the bases empty and a 20-second timer with runners on, plus a 30-second timer between batters. Pitchers who exceeded the clock were charged with a ball; hitters who were not in the box and looking at the pitcher were charged with a strike. The first season delivered an immediate 24-minute reduction in average game time, and subsequent refinements in 2024 and 2025 trimmed further.
The other rule changes bundled with the pitch clock matter for context. Larger bases (15 inches square instead of 13) increased stolen-base attempts and success rates. The shift restriction (two infielders required on each side of second base) shifted batting averages on balls in play upward, particularly for left-handed pull hitters. Disengagement limits (two pickoff attempts per plate appearance) further encouraged base-stealing aggression. Each of these affected scoring environments in subtle ways.
Taken together, the package was the most significant change to the on-field product since the introduction of the designated hitter. The intention was to speed up the game while increasing action. The result has been faster games with marginally more offence per inning but fewer total innings as the season has settled. The aggregate scoring per nine innings has shifted only slightly, but the variance and the within-game pace are dramatically different.
2025 Game Length Data
The 2025 season produced an average MLB game time of 2 hours 38 minutes, which is the lowest league-wide figure since the 1980s. The distribution of game lengths is even more striking than the average. Only three games in the entire 2025 season ran 3 hours 30 minutes or longer. Compare that to 2021, where 391 games crossed the same threshold, and the magnitude of the change becomes clear.
From a betting perspective, the implication is that long games as a residual category have effectively disappeared. A regular-season MLB game in 2025 is reliably going to finish in 2.5 to 3 hours unless something genuinely unusual happens, like a 13-inning extra-innings affair or a 90-minute rain delay. That tightness in the distribution affects everything from in-play hold percentages to the structural probability of various totals outcomes.
The other dimension worth flagging is the pace within the game. Half-innings end faster, pitching changes happen quicker, and the time between meaningful events is compressed. That changes what a punter watching live can actually process before placing a bet, and increases the relative advantage of pre-game models versus in-play reactions.
Effect on Totals Pricing
The headline question is whether the pitch clock has actually moved totals lines. The answer is yes, but less dramatically than first-instinct would suggest. The reason is that scoring per inning has gone up slightly even as the number of innings (and the per-game scoring opportunities) has stayed essentially the same at nine. Total runs scored per game has not collapsed.
What has shifted is the relationship between game length and scoring environment, and the structural dependability of totals lines. A 7.5 totals line in 2021 carried meaningful in-play volatility because a long game with extra plate appearances could produce an over from nowhere. A 7.5 totals line in 2025 is much more closely calibrated to the actual scoring expectation, because the game length is constrained from above. The market is tighter, the lines are sharper, and the casual under that I used to find priced lazily at 1.95 is now priced at 1.92.
The mechanics of how those lines are constructed is detailed in the broader explainer on the totals market in detail. The pitch-clock-era refinement on top of that framework is that variance per game has compressed, which makes the totals market harder to extract value from on the in-play side and slightly easier on the pre-game side where weather and lineup matchups can still produce model edges.
Effect on Pitcher Prop Counts
The pitcher prop market has been more affected by the pitch clock than the totals market. A starter in 2021 could throw 110 pitches across seven innings; the same pitcher in 2025 throws 95 pitches across six innings. Pitch counts are down because innings are down, even as pitch quality per pitch has held or improved.
For strikeout props, the implication is direct. A starter projected for 7 strikeouts under 2021 usage is more like 6 strikeouts under 2025 usage, simply because there are fewer plate appearances against him. UK punters who model strikeout props on pre-2023 pitcher career stats are using a sample that no longer reflects current usage patterns, and the bookmakers have adjusted faster than the recreational market has.
The cleaner play in the pitch-clock era is on outs-recorded props rather than strikeout props. A starter’s outs-recorded ceiling has also come down (15 instead of 18, on average), but the volatility of strikeout count within those outs is lower because each plate appearance is more like every other one in tempo. Outs-recorded props price more efficiently as a result.
Bullpen Impact in Shorter Games
The most under-discussed pitch-clock effect sits in the bullpen. Shorter starter outings mean more bullpen innings, which means relievers throw more total appearances over a season. The cumulative fatigue effect on key relievers shows up in mid-summer and again in September, and that fatigue is one of the few signals that a sharp punter can use that the public market still sometimes misses.
Track high-leverage bullpen usage across a five-game window. A team whose closer has thrown four times in five days is materially worse than the same team with the closer fully rested, and the moneyline market does adjust but not always in proportion to the actual performance hit.
Have MLB totals lines actually moved down since pitch-clock introduction?
Does a faster pace mean more or fewer pitcher strikeouts?
Material created by the team StitchLine
