OMAHA, Neb. — A doubleheader spelled double trouble for the UCLA baseball team’s stay at the College World Series.

The 15th-ranked Bruins lost two games against Southeastern Conference teams in the span of 12 hours on Tuesday, ending their season rather abruptly after six straight postseason wins.

UCLA dropped a pair — first 9-5 in the completion of Monday’s suspended game against sixth-ranked LSU, then a 7-3 loss to No. 3 Arkansas in an evening elimination game at Charles Schwab Field Omaha.

The losses bounced the Bruins (48-18) from their first CWS appearance since 2013.

“It feels somewhat easy when you’re here, but I think everybody knows how difficult it is to get here,” UCLA head coach John Savage said. “I’m just so proud of our guys.”

After scoring three runs in the first inning on Monday night before a lengthy weather delay against LSU, UCLA scored in just two of 15 frames on Tuesday.

LSU (50-15) got stellar pitching Tuesday morning from freshman Casan Evans and did enough at the plate to advance into today’s Bracket 2 final.

Star shortstop Wehiwa Aloy drove in three runs for Arkansas (50-14) in the nightcap — two coming on a first-inning home run — to support a Razorbacks pitching staff that ran their scoreless streak to 18 innings before a few late ones for the Bruins.

“Disappointing day for sure,” Savage said. “Tough day. Tough circumstances. But at the end of the day, you know, you’ve got to give credit to LSU and certainly Arkansas.”

Arkansas will meet LSU again — the two squared off in their Saturday CWS opener — today at 4 p.m. PDT. Arkansas will need to beat the Tigers twice in two days to advance to the best-of-three championship series.

With their backs against the wall for the first time this postseason, the Bruins were aggressive from the start. Dean West and Roch Cholowsky both singled to open the game and moved into scoring position on a long flyout.

Roman Martin walked to load the bases, but AJ Salgado lined out to shortstop and West was caught trying as straight steal of home, a play that was reviewed and confirmed by the narrowest of margins.

After ducking that early shot, Arkansas threw a roundhouse of its own with a couple of quick runs in its half of the frame.

Leadoff hitter Charles Davalan greeted UCLA starter Cody Delvecchio, who was making his first appearance since the end of March, with a quick single. Aloy, the SEC Player of the Year, then belted a 377-foot, opposite-field home run into the bullpen in right — his 21st homer of the season.

“Just a really solid job by our offense, getting on base,” Razorbacks coach Dave Van Horn said. “And Wehiwa got the big hit, gave us a cushion. Went oppo and hit it really hard.”

Added Aloy: “Got it pretty good and put some runs on for the team.”

With the lead in hand, starter Zach Root (9-6) then settled in. The junior left-hander retired the next six in a row — including four straight strikeouts at one point in that stretch — and faced the minimum through the next four innings.

He got into trouble in the fifth when Payton Brennan singled to open the frame and Phoenix Call later walked. But West was called out on strikes to end that threat.

Root covered the first five innings, striking out five and giving up just three hits on 87 pitches, just three days after being pulled in the second inning of Arkansas’ loss to LSU.

“He went out today and just proved why he’s one of the best left-handed pitchers in the country,” Van Horn said of Root. “If we get to play long enough, maybe he’ll get to pitch again.”

Aiden Jimenez followed Root with three shutout innings of his own to make it 18 straight zeroes that Razorback pitchers put up, a span that included Monday’s historic no-hitter by Gage Wood.