David Joplin scored 15 of his 19 points in the second half and reached a career milestone to lead the No. 9 Marquette Golden Eagles to a 72-70 win over the host Xavier Musketeers in a Big East contest Saturday in Cincinnati.All-American guard Kam Jones had 20 points, including seven clutch points in the final two minutes for Marquette (11-2, 2-0), which won its second straight conference game.After Jones made a free throw with 3.6 seconds left, Ryan Conwell lost his balance just across midcourt as Marquette’s Chase Ross made an effort to disrupt his path to the basket. No foul was called as time ran out on Xavier (8-5, 0-2), which lost its third straight, all to Top 25 opponents.Marcus Foster had 16 to lead Xavier while Jerome Hunter added 15 for the Musketeers. Dailyn Swain chipped in with a double-double for Xavier with 13 points and 10 rebounds.Marquette narrowly avoided blowing a double-digit road lead in the second half for the second straight Saturday in Southwestern Ohio. Last Saturday, the Golden Eagles led at Dayton by 13 early in the second half and were outscored, 46-31, to fall to the Flyers.Saturday in Cincinnati, Marquette led by 15 with seven minutes remaining but had to withstand furious rally by Xavier, which used a 14-0 run to take a 64-63 lead on a Hunter layup with 2:17 left.But Jones answered with a layup 20 seconds later, igniting a 6-0 spurt to give the Golden Eagles the lead for good. Jones then drained a pair of free throws with 10.8 seconds left to give Marquette a three-point lead.Xavier opened hot from beyond the arc as Swain, Foster and Dante Maddox Jr. all drained three-pointers to stake the Musketeers to leads of 12-6 and 15-11.