Young's breakout performance at the plate comes after a rough first two months in Minnesota. He entered the game hitting .264 with no homers and just 15 RBIs after coming over in a trade from Tampa Bay.
The 22-year-old had RBI-doubles in the second and sixth innings before giving the Twins the lead for good with another two-bagger off Kyle Farnsworth (0-2) that scored Michael Cuddyer in the eighth.
The only thing Twins fans have been waiting to see longer came in the seventh, when Mauer hit a solo homer to tie the game 5-5 and ruin Andy Pettitte's bid for his 170th victory as a Yankee, which would have tied him with Ron Guidry for fourth on the Yankees career list.
Despite his AL batting title in 2006 and a gaudy .315 average entering Monday night's game, the hometown fans have constantly been wondering when they were going to see the 6-foot-5, 230-pound lefty with the sweet swing put one in the seats.
His first home run since Sept. 29 slammed off the facing of the upper deck in right field and helped the Twins earn a split over the Yankees.
Joe Nathan picked up his 15th save in 16 chances and Matt Guerrier (3-1) pitched 1 2-3 innings of scoreless relief for the win.
Alex Rodriguez continued his staggering dominance in the Metrodome with three hits, including a homer, a double and two RBIs and now has a .379 career average under the Teflon roof, higher than any other player with at least 175 at-bats there.
He singled off Nathan in the ninth, but Hideki Matsui grounded into a double play and Jason Giambi lined out to center field to drop the Yankees to 3-4 on the road trip.
Derek Jeter had three hits to move within two of tying Mickey Mantle (2,415) for third on the Yankees' career list, but Farnsworth faltered in relief once again for New York.
In his last seven appearances, Farnsworth has given up seven earned runs, 12 hits and four homers over 7 1-3 innings.
New York led 4-2 in the sixth on RBIs by Melky Cabrera and Johnny Damon, but the Twins came right back with two of their own to tie the game in the bottom of the inning.
The Yankees left 10 runners on base and managed only five runs against starter Livan Hernandez despite getting 13 hits off him.
