By Justin A. Rice, Globe Correspondent

A game between two teams that qualified for the city tournament last spring got interesting Thursday when O’Bryant took a one-run lead against East Boston in the fourth inning at City Yards.

But after senior Gabby Martinez’s bunt scored two runners to give O’Bryant the lead, East Boston broke open the game with a four-run fourth before ultimately winning, 13-6.

The catalyst of East Boston’s big fourth inning was junior Kayla O’Brien, who scored the go-ahead run to make the score 4-3 just moments after being inserted into the lineup.

“I don’t think it’s really that hard, I’ve been playing my whole life,” O’Brien said of coming in off the bench. “I just love being in the game. I was just excited to get that run when we were down."

After drawing a walk, O’Brien was brought home by sophomore catcher Anamaria D’Argenio, who also had an RBI double in the Jets’ six-run sixth inning that iced the game.

“It worked out for me,” said East Boston JV coach Robin Sutera, who was filling in for varsity coach Tom Elliott (who had a death in the family). “I just felt like at that point I needed to change a little bit. She wanted to play.”

It didn’t hurt that East Boston logged 16 hits on the day.

“They hit very well,” Sutera said. “We did what we had to do today, we came to play today, we all did an awesome job.”

The win puts East Boston in the driver's seat to clinch the No. 1 seed out of the North division for the city tournament over Memorial Day weekend. East Boston is 3-6 overall but 2-0 against city league opponents.

“We try so hard to get to [the city tournament] and it’s a big thing for us,” said sophomore pitcher Danielle Elliott, who got the win for East Boston by striking out seven batters.

Kristen O’Brien struck out five in a losing effort for O’Bryant (7-2) while Naya Shedd had an RBI and scored two runs.

“We came in really prepared, really excited, we wanted the game really bad,” O’Bryant coach Bridget Ryan said, “and I thought we played lights-out phenomenal up until the bottom of the sixth inning. Couple of passed balls, [gave up] some really nice hits. But we played well and we have to be happy about that."

Justin A. Rice covers Boston Public school athletics. He can be reached at jrice.globe@gmail.com. Follow him on Twitter @GlobeJustinRice or @BPSspts.