LSU's Josh Smith is safe at second base as he beats the attempted tag by kentucky's Alex Rodriguez , on Saturday ,during the first game of a double header at Alex Box Stadium.

After winning the first game of Saturday's doubleheader against Kentucky on a walk in the 12th inning, LSU clinched the first series of its Southeastern Conference schedule.

The No. 10 Tigers won the second game of the day 16-4 at Alex Box Stadium. 

LSU (14-5) busted open the game early, scoring six runs — one earned — in the second inning. Center fielder Zach Watson later hit his second home run of the season, and by the end of the fourth inning, LSU led 14-3.

"We started hitting," coach Paul Mainieri said, "and really never stopped."

The offensive explosion, aided by three Kentucky (13-6) errors, complemented the performance of starter Cole Henry, who exited last week after four scoreless innings with tightness in his upper back behind his throwing shoulder.

Henry did not pitch at a his best, but making his first SEC start, he allowed three runs over five innings. After he allowed the first two batters of the second inning to reach base, Henry said the game sped up.

"You feel like you're throwing pitch after pitch," he said.

Henry breathed, calmed himself down and, after allowing a run, ended the inning on two swinging strikeouts. Wearing down, he gave up another two runs in the fourth inning.

Henry did not pitch much this week as he recovered from the tightness in his back, but he thought the time off helped him after pitching multiple games a week.

"My arm felt a lot better," Henry said. "Everything wasn't tired."

LSU scored another five runs in the fourth inning, its final burst before the game winded to a close. Watson's home run, which he wanted to hit because his niece was the child guest public address announcer that inning, highlighted the inning.

Though he drove in five runs, Watson came a triple shy of the cycle. He walked his final trip to the plate.

"That last at-bat I was trying for it," Watson said. "I really didn't want to walk, and I was pretty mad when I did."

Completing the doubleheader and a day of pitching unlike LSU had experienced this year — four Tigers threw 17 shutout innings during the two games — Trent Vietmeier recorded a career-high six strikeouts. He allowed one run over four innings.

Mainieri entered the game concerned about LSU's ability to get through the series with a pitching staff riddled by injuries, but the Tigers have most of their healthy pitchers available for Sunday's series finale and a confident lineup.

"The task I have," Mainieri said, "is to get the guys to calm down."

Follow Wilson Alexander on Twitter, @whalexander_.