"Captain America" is the nickname given to 24-year-old Phillie Luke Williams.
However, the nickname has Mets fans triggered, as former Mets seven-time all-star third baseman David Wright was nicknamed "Captain America" after his performance in the 2013 World Baseball Classic.
Check out some of the mentions to this tweet from KYW's Dave Uram.
On Wednesday, Williams made his first career start. It was just his second day in the majors and with his team down to their final out, Williams hit a walk off home run to give the Phillies a 2-1 victory and the team's best moment of the season.
Williams helped Team USA clinch a spot in the Tokyo Olympics earlier in the week, before getting the big league call up.
Williams' family was at the game and he was emotional talking about it.
"You're gonna make me cry," he said. "I can't even explain it. It's pretty awesome."