A crowd of 1,388 packed the stands on a day where the mercury hit a record 80 degrees for April 17 and saw the Huskies (19-12, 9-6 Pac-12) win the series two games to one and beat the Bruins (15-18, 6-9) in a series for the first time since 2005.
After UCLA took a 2-0 lead in the top of the second on a two run single to center by Brett Urabe, the Huskies got to starter Kyle Molnar (2-4) for four runs in the bottom of the fourth.
Jack Meggs led off with a line single to left. Two outs later, Gage Matuszak got hit by a pitch and M.J. Hubbs walked to load the bases for Baker. He took a ball, strike, and another ball before launching the next pitch well over the wall in left center field for Washington's first grand slam since 2012 and a 4-2 lead. The homer also tied him with Josh Cushing for the team lead with five.
UCLA came back with a run in the top of the fifth to make it 4-3. Daniel Rosica got hit by a pitch from Spencer Jones, advanced to second on a groundout, took third on a sacrifice by Daniel Amaral, and scored on a single to center by Eric Filia.
The Huskies made it 5-3 in the bottom of the seventh. K.J. Brady led off with a walk, got sacrificed to second, and one out later scored on a double off the yellow tape on the wall in right center by Morgan.
The Bruins made it a one run game again at 5-4 in the top of the eighth when Filia singled with one out and scored on a double over the head of Meggs at the 395 marker in right center by Sean Bouchard.
Brady helped prevent a possible bigger inning for the visitors when he made a terrific diving catch on what looked like a routine fly ball. Meggs should have made the play but he appeared to lose the ball in the sun, and Brady came over from right to snare the ball at the last possible second.
The Huskies upped the lead to 7-4 in the bottom of the eighth. Kyle London got hit by a pitch and Baker walked. The runners advanced on a sacrifice by Levi Jordan. Nyles Nygaard plated London with a single to right and Baker scored on a balk by fifth Bruin pitcher Brian Gadsby.
On the mound, Jones (3-2) got the win with four and a third innings of relief. He gave up one run on one hit. He did not walk or strike out anyone.
Troy Rallings pitched the final three innings to notch his ninth save of the season. He gave up a run on a pair of hits. He walked one while striking out none.
For the Bruins Molnar allowed four runs, all earned, on three hits. He walked four and struck out six.
After an off day on Monday the Huskies play a single non-conference game at Seattle University before welcoming the St. Mary's Gaels to Husky Ballpark for a four game series April 22-24.