Lash finished with a six-hitter, three strikeouts and a walk.
"I thought he threw real well," said Midd-West coach Ron Flood. "He hasn't thrown for a long time because I've got the two horses (fellow seniors Austin Hockenbrock and Colton Keister) and I've been using them. He threw a real good ballgame."
Midd-West posted its second 5-3 win in as many days, following Tuesday's game at Mifflinburg. The Mustangs (6-5) have won four of five to inch past .500.
"We're starting to peak," said Flood. "Right now we're starting to play real good defense -- we've played without errors for the last three or four ballgames -- and we're starting to hit the ball. They're doing the things that they have to do right in order to win games."
The Mustangs scored two first-inning runs with three straight two-out hits. Lash and Luke Zimmerman reached with singles, and Hockenbrock followed with a screamer to right field that took a wicked hop past charging Erich Kline for a triple.
They scored another pair in the fourth when Shane Connahan led off with a double, Aaron Sharp chopped an infield hit high off the pitcher's glove, and Colton Snook muscled an opposite-field line drive to right -- all before the first out was made.
Lewisburg wasn't able to string together hits as easily.
Smith smoked Lash's first pitch of the game to the gap in left-center for a double that nicked the glove of diving center fielder Connahan. Smith was ultimately stranded at third when Snook made a fantastic diving catch of a Gardner shot on the left-field line for the third out.
Lash needed a total of just 27 pitches to get through the second, third and fourth innings. The Green Dragons (3-7), who hadn't played in a week, gave away three consecutive one-pitch outs at one point.
"Don't swing at curveballs -- that's my philosophy and I've been telling them that, but it must look good to them," said Kline. "You could see, though, as the game went on we started to come around."