Lamet threw 29 pitches, allowing one hit while striking out four and walking one. His final pitch was an 87-mph slider; one pitch earlier, he threw a 95-mph fastball.
This was Lamet's first start of the season. His breakout 2020 campaign ended early due to a bicep injury.
Manager Jayce Tingler said postgame that Lamet will undergo an MRI, according to Annie Heilbrunn of the San Diego Union-Tribune. However, he was optimistic that the tightness might have been from adrenaline, as he didn't feel any symptoms during his warmup, according to ESPN's Alden Gonzalez.
"It gives him a chance to maybe continue to pitch and go forward, but we’ll just have to wait and see," Tingler added, Gonzalez reports.
The 28-year-old underwent Tommy John surgery in 2018 and received a platelet-rich plasma (PRP) injection in his elbow last fall.