The 12-year-old right-hander struck out 13 and also had a two-run single in the fifth. When it was over, he fell to the ground as his teammates piled on top of him near the mound.
Matt Kubel homered for Connecticut, which will play California in a rematch on Tuesday night. Connecticut lost the first matchup 6-4 last week.
Indiana manager Tim Porter said Lucas was effective changing speeds.
PETALUMA, CALIF. 5, PARSIPPANY, N.J. 4
Danny Marzo hit a game-winning homer in the eighth inning and Petaluma, Calif., beat Parsippany, N.J., to move on.
The 12-year-old Marzo drove an 0-1 pitch to the grassy hill beyond the right-field wall, setting off a wild celebration after California blew a two-run lead.
New Jersey pushed across two runs in the sixth to tie it at 4 as Emil Matti homered and David Ton had an RBI single.
WILLEMSTAD, CURACAO 4, VANCOUVER, B.C. 3
Christopher Koeiman drove in two runs with a tying sacrifice fly, Mychellon Jansen hit a tiebreaking solo homer and Willemstad, Curacao advanced.
KEARNEY, NEB. 17, RAMSTEIN, GERMANY 1
The kids from Kearney, Neb., have earned the state’s first-ever win at the Little League World Series.
Jared Wagner went 3 for 4 with five RBI as the Midwest champs rolled.
NUEVO LAREDO, MEXICO 4, TAOYUAN, TAIWAN 3
Nuevo Laredo, Mexico scored three runs in third to take the lead, including two on a throwing error, and went on to a victory over Taoyuan, Taiwan.
Felix Diaz struck out five in 4⅓innings for Mexico.