LOS ANGELES, Calif. -- Notre Dame sophomore Kevin DeFilippis made his 2013 debut in grand fashion. As a pinch hitter in the bottom of the 11th inning. he ripped a walk-off RBI single to give the No. 26 Fighting Irish a come-from-behind 6-5 victory against No. 14 Oklahoma at Jackie Robinson Stadium on Sunday. The Irish improved to 10-3 on the season, while the Sooners dropped to 12-4.

DeFilippis stepped to the plate with the game tied at five, and runners on the corners with one out. He was pinch hitting for Irish junior All-American closer Dan Slania. DeFilippis took the first offering from Robert Tasine -- the first pitch he has seen the entire season -- and pulled a drive down the left field line that one-hopped the wall. Sophomore right fielder Ryan Bull trotted home from third base to give Notre Dame its second victory of the season against a top-25 foe.

Slania picked up the victory in relief and improved to 2-0 on the year. He tossed 3.1 scoreless innings. Slania struck out two and limited Oklahoma to one base hit. He has logged 13.1 innings this season and has yet to allow a run.

Billy Waltrip took the defeat and dropped to 0-1. He allowed two earned runs on four hits and four walks in 3.1 innings. Waltrip also fanned four.

Freshman designated hitter Ricky Sanchez was the lone Irish player with more than one hit, but a total of 10 different Notre Dame players collected hits. Sanchez went 3-for-5 with a run scored.

Trailing 5-4 in the ninth, Irish sophomore pinch hitter Phil Mosey opened the inning with a pinch-hit double.

Senior second baseman Frank Desico followed with a bunt single. With runners on the corners and still no outs, Bull drew a four-pitch walk to load the bases for junior third baseman Eric Jagielo, who belted a two-run home run back in the fifth inning to tie the game at four. Waltrip got Jagielo to pop out. Junior first baseman Trey Mancini lifted a fly ball to relatively deep center field to score pinch runner Conor Biggio to tie the game at five. DeSico moved up 90 feet to third base on the sacrifice fly and senior center fielder Charlie Markson nearly legged out an infield single that would have ended the game.

Jagielo went 1-for-6 with his team-best fifth home run of the season and second in as many days.

Notre Dame jumped out to a 2-0 lead on a two-run triple from freshman shortstop Lane Richards in the bottom of the second inning.

Freshman starting pitcher David Hearne did not factor in the decision. He allowed four runs, all earned, on six hits in 4.2 innings of work. Hearne struck out two and did not issue a walk. Sophomore pitcher Matt Ternowchek tossed a scoreless inning of relief. Freshman lefty Zak Kutsulis pitched 0.2 scoreless innings of relief. Sophomore righty Cristian Torres allowed a run in 0.2 innings. His leadoff walk in the top of the eighth inning led to Oklahoma taking a 5-4 lead. Junior righty Donnie Hissa did not allow a run in 0.2 innings of work.

Notre Dame improved to 3-1 in extra-inning games and 5-3 in one-run games this season. A single run has decided eight of the 13 games for the Irish this year.