The right-hander allowed four runs on five hits in the first inning of Game 5 of the ALDS against the Houston Astros and was eventually removed following just 2 2/3 innings. After looking at video of the contest, he said postgame it was "pretty obvious" that he was tipping his fastball, according to Marc Topkin of the Tampa Bay Times.
The Astros opened the game with four straight hits off Glasnow, and it seemed like they knew what was coming, as Houston's hitters communicated their observations while passing the baton.
Astros players weren't the only ones who noticed that Glasnow might've been tipping his pitches. Analysts - and former big-league hitters - Alex Rodriguez, David Ortiz, and Frank Thomas broke down their thoughts on the 26-year-old giving something away.
MLB Network's Dan Plesac also analyzed Glasnow's pitch sequencing.
Glasnow was able to right the ship by retiring the final seven batters he faced. But the damage was done after he allowed four runs in the first inning.