Leon followed with a two-run, ground-rule double that chased Cobb.
Tim Beckham's two-run single had pushed the Rays ahead in the fourth - with both runs unearned after third baseman Josh Rutledge bounced a throw.
Porcello simply accredited the tough innings to not hitting his spots.
In what has become a corresponding roster move, the Red Sox have elected to option right-handed starting pitcher Kyle Kendrick back down to Triple-A Pawtucket.
For his major league tenure, Ross now owns a 3.84 ERA over the course of 262 regular-season appearances, 12 starts and an even 326 innings of work. He now has an 0-2 record against the American League East foe on the 2017 campaign with a 9.58 ERA. But the team is only 3-3 in that stretch.
"It's just the result of some poorly executed pitches", Porcello said of his struggles against the Rays.
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The 27-year-old southpaw is now in the midst of his sixth big league campaign, three of which have come as a member of the Red Sox.
By then, the Red Sox offense was playing catch-up, and despite a convincing rally, couldn't get the hit they needed to complete the comeback bid. It's safe to say that he didn't make the most of the opportunity. "We've tried four or five guys there this season".
The Red Sox pulled out the final game of the series after losing the first two games. The Red Sox catcher has had a flare for the dramatic this season, as 11 of his 13 RBIs have come in the seventh frame or later.
Tampa Bay starter Blake Snell (0-3, 3.96 ERA) is stuck in a five-inning rut of late. He also doubled, finishing the night 2-for-4.
Bogaerts' first-inning single - which pushed his major league-leading hitting streak to 15 games - was the Sox' only hit until the seventh, when their bats finally started to heat up. Moreland leads the club with 20 base-on-balls. But the Red Sox right-hander left Fenway Park last night probably feeling some deja vu. "This year, all Pride Night attendees are invited to a pre-game party on the Right Field Roof Deck".