Morse, acquired from the Nationals to help bolster the Mariners offense, tied a club record for most Cactus League home runs with his first-inning blast to left field. The 6-foot-5, 245-pound outfielder went 1-for-1 with a pair of walks, putting his spring average at .365 with 14 RBIs.
In a matchup of former Cy Young winners, Kershaw gave up five hits and three runs in three innings, while Felix Hernandez allowed three runs on nine hits over six frames for Seattle.
Both aces were making their final spring starts prior to Opening Day. Kershaw will open against the Giants on Monday at Dodger Stadium, while Hernandez is slated for his sixth Opening Day start the same night against the A's in Oakland.
Kershaw finished his spring with a 4.18 ERA in seven starts. He was replaced in the fourth by Ted Lilly, who gave up seven runs on six hits and three walks in 2 1/3 innings.
Playing a lineup of nearly all backups, the Dodgers pushed a run across against Hernandez in the second on singles by Nick Buss and Alex Castellanos, with Buss scoring on a blooper to right field by Justin Sellers. Right fielder Michael Saunders short-hopped that ball and threw to second to force Castellanos as Buss crossed the plate.
Third baseman Jerry Hairston had two of the hits against Hernandez, going 2-for-3 with a double to hike his Cactus League average to .200 (8-for-40). Lilly had a two-run double in the sixth.
Hernandez threw 96 pitches in his final spring tuneup and had one walk, three strikeouts and hit a batter. His final ERA was 2.65 in four Cactus League starts.
Mariners manager Eric Wedge was ejected in the sixth inning for coming out to argue with the home-plate umpire after Hernandez expressed unhappiness over a called ball.
Mariners catcher Jesus Montero went 2-for-4 with an RBI single in the third and is batting .415, while Dustin Ackley tripled and scored in the fourth off Lilly and also went 2-for-4 on the day.
Minor League callup Nate Tenbrink broke things open for Seattle with a three-run double in the sixth that made it 9-3 and knocked Lilly out of the game.
The Mariners have been hitting well all spring and now have a club record 55 home runs with two games to go. The Mariners have gone deep in 30 of their 31 games and are tied for the third-most spring home runs by any Major League team in the past 20 years, trailing only the 1999 Cubs (62) and 2006 Royals (56).
Up next for the Dodgers: Having shifted the final days of camp from Arizona to California, the Dodgers play a pair of split-squad games Thursday. In Anaheim, Hyun-Jin Ryu starts against the Angels and former Dodger Joe Blanton at 7:05 p.m. And in Rancho Cucamonga, Stephen Fife will start for the Dodgers against former first-round pick Chris Reed and their Single-A team affiliate at 6:05 p.m.