PHILADELPHIA — When Luis Arraez arrived in the Phillies clubhouse just after 3 p.m. on Tuesday, he bounded up to former teammate Jesús Luzardo and chatted a bit. Within the next 15 minutes, Arraez had put on the red pinstripes for the first time, talked to the media, embraced his former Giants teammate (and trade-mate) Caleb Kilian and ran out the door of the clubhouse, insistent he not be late to anything on his first day.This is the chaos surrounding a player dealt at MLB’s trade deadline. Even Arraez’s mad dash to check everything off his list ahead of his Phillies debut was seemingly infected by the energy those around him say is one of his best qualities.“He’s going to get his knocks,” Luzardo said, “but the energy he brings in the clubhouse, the dugout, on the field — (he) just kind of keeps it light.”“We need that energy, that kind of person,” said Jhoan Duran, a good friend and former teammate of Arraez’s with the Minnesota Twins. “He (will) be good with everybody here. That type of player, we need it because everybody here (hits) homers. (He will) put the ball in play every time we need it.”Duran, who spoke to The Athletic on Monday, was prescient: Arraez went 2-for-4, driving in a runner during each of his first two at-bats as the Phillies beat the Washington Nationals 5-0. His contact-heavy skills are unique in the Phillies lineup, and across MLB, but it plays. He delivered in his first game with the Phillies, marking the beginning of a grand experiment reshaping the club’s defense and lineup in the final two months of the regular season.Much about Arraez is unique in modern-day baseball: his knack for putting the ball in play, his near-inability to strike out. This separates his game from nearly everyone in the Phillies’ lineup. Arraez has the lowest strikeout rate (4.5 percent) of any qualified hitter in MLB; Kyle Schwarber has the highest (34.8 percent). Arraez, with a .327 average on balls put in play, now has the second-highest rate of any Phillie in that category (Brandon Marsh, naturally, is first). His batting average (.325) is 46 points higher than the next-closest Phillie (Marsh, .279).After receiving a standing ovation, Luis Arraez hit an RBI single in his first at-bat with the Phillies. (Mitchell Leff / Getty Images)It was a difficult decision for interim manager Don Mattingly as he weighed whether Arraez should hit leadoff or cleanup. He could excel as a tablesetter or drive in runs, as he did while hitting cleanup Tuesday. It was his 40th game in the majors hitting cleanup; he has played 946.“I don’t think I could really mess it up either way,” Mattingly said pregame. “But for now, that’s where we’re going to start.”