ARLINGTON, Texas - Their starting pitcher lasted two-thirds of an inning, putting them in an immediate five-run hole.

So how well are things going for the Yankees?

They needed all of a half-inning to take the lead, doing so with a remarkable 11-run second, sending the Bombers to a 21-5 victory over the Rangers Tuesday night in front of 28,403 at Globe Life Park.

The Yankees, now a season-best 15 games over .500 at 57-42 and seven games ahead in the AL East, sent 15 to the plate in the 11-run inning, collecting nine of their 19 total hits. After the early 5-0 deficit, the Yankees, an MLB-best 16-5 in July, scored 21 unanswered.

The vast majority of the second-inning damage came against overmatched Rangers lefthander Martin Perez, who allowed eight runs and seven hits in his one-inning-plus-eight-batters outing.

It marked the most runs scored in an inning since the Yankees put up 12 in the first inning against the Orioles in Game 2 of a doubleheader July 30, 2011.

Brendan Ryan had a pair of RBI doubles in the inning, Chase Headley contributed a pair of RBI singles and a suddenly scorching Didi Gregorius, who had a career-best four hits in the game, ripped a three-run triple.

Chris Young hit a grand slam, his second of the season and fourth of his career, in the third to make it 15-5. His RBI double in the sixth made it 17-5.

The Yankees had 14 hits through three innings. The Rangers (47-52) had no hits after the first.

Chris Capuano got the start as Joe Girardi wanted to give all of his starters an extra day's rest.

On a pitch count of about 50, Capuano threw 42 in the first inning -- 18 of them strikes. Capuano allowed five runs, three hits and five walks in his two-thirds of an inning, saved from a worse line by rookie Diego Moreno, called up earlier in the day from Triple-A Scranton/Wilkes-Barre.

The 28-year-old righthander, who replaced rookie Nick Goody because the Yankees believed they might need a pitcher who could give them some distance out of the bullpen Tuesday Moreno (1-0) was terrific over 51/3 shutout innings in which he didn't allow a hit and retired the last 10 he faced.

Young started the second-inning carnage with a double and Headley, 24 for his last 65 (.369) coming into the night, brought him in with a single to make it 5-1. John Ryan Murphy singled and Gregorius was hit by a pitch to load the bases. Ryan then punched a grounder past second baseman Rougned Odor, who had broken toward the bag, for what turned out to be a two-run double that made it 5-3. Jacoby Ellsbury's RBI single made it 5-4 and Brett Gardner's single back up the middle tied it at 5. Alex Rodriguez crushed the second pitch he saw off the wall in left for an RBI double that made it 6-5 and put a merciful end to Perez's night. Lefthander Wandy Rodriguez came on to face Mark Teixeira, who struck out. Then the Yankees went right back to scoring.

Young walked and Headley singled again to bring in Gardner to make it 7-5. Gregorius' three-run triple broke the game open in the Yankees' favor at 10-5. Ryan's double made it 11-5.

Moreno retired the Rangers in order in the bottom half. Young's grand slam off Rodriguez in the third made it 15-5.

Gardner hit a two-run homer off Rangers infielder Adam Rosales in the ninth to make it 21-5.