There is one group of Red Sox fans with absolutely nothing to complain about.

They are not at Fenway Park, but at Merrill "Red" Wilson Field in Yarmouth.

The Yarmouth-Dennis Red Sox entered Friday night's game against the Cotuit Kettleers at 5-0, looking like the best team on the Cape.

However, Cotuit handed Y-D its first loss of the season, rallying for a 4-3 victory in a game that featured multiple lead changes over the final two innings.

Y-D currently leads the league with a .266 team batting average, a 2.09 team ERA and a .187 opposing batting average. Through the first week of the season, it has been nearly impossible to score against the Red Sox and their elite pitching staff.

"We're not worried about ERA, it's about getting outs," Y-D manager Scott Pickler said. "We had a couple situations where we couldn't get a key out, and we made some bad pitches, and they hurt us."

After allowing just 12 runs through their first five games, the Red Sox surrendered three runs after the eighth inning, which ultimately cost them the game.

Pickler was frustrated with the result after a near-perfect start to the season.

"If you make a bad pitch and you can't concentrate, those things happen," Pickler said.

Much like the current Boston Red Sox, Y-D has a deep pitching rotation but got beaten Friday night due to a lack of substantial offense.

For much of the night, neither team could create separation. Y-D scored first in the second inning when Kevin Takeuchi came around to score on an RBI sacrifice fly from Tommy Goodin. They held a 1-0 lead until Cotuit's Jake Hanley tied the game with a 378-foot solo home run in the fourth.

The game remained deadlocked at 1-1 until the eighth inning, when both offenses finally broke through. Hanley launched his second home run of the night and both teams traded the lead before the game reached the ninth inning.

Y-D’s dugout participated in an overhead viking clap as they crept closer and closer to the field. They wanted this rally to be over and their streak preserved.

With the game on the line, a surprising name stepped up.

Cotuit's Seojun Oh had just one, pinch-hit at-bat, but delivered the biggest hit of the night, a go-ahead, bases-clearing two-RBI single that gave the Kettleers the lead for good.

Oh’s clutch hit was nothing special for the Korean catcher. Oh came from South Korea to play college baseball and has mashed, hitting .351 with 17 home runs for High Point University in the spring.

Maybe it was the smell from the Red Sox signature donut burger in the air at Merrill "Red" Wilson Field, but Oh had something else on his mind when he walked up to the plate with the Kettleers down one in the ninth.

"I wasn't really thinking about much,” Oh said. “My host family was here, and they were yelling something like, 'home run! T-bone steak!’ so I was thinking about dinner."

Oh’s freakishly-calm demeanor in high-leverage situations stems from his background. He played against the best talent in Korea’s highly-competitive high school circuit and has carried that same approach into his game on the Cape.

"I don't really feel pressure, I love those kinds of situations, it’s just another game,” Oh said.

As Oh ended the Red Sox winning streak, he carried Cotuit out of a three-game winless streak and gives them momentum to carry.

For most of Friday night, Y-D’s dominance still showed and Pickler has no concerns of their form dropping. They were one T-bone steak away from remaining the sole undefeated team in the league.

"We just want to come out and compete every day,” Pickler said. “We need to learn to play every pitch, and to go to the plate and make quality at-bats. If they do that, we'll have a good season."

Y-D remains one of the favorites in the league, but Cotuit showed just how fine the margins are on the Cape and what it takes to win.

"We’re just trying to have fun,” Oh said. “Everyone is a really good player here, some of the best in the nation, so we’re just trying to enjoy it."