Down 12-2 after 5, Seattle did WHAT?

SAN DIEGO — In the span of two innings Thursday night, the Mariners turned a double-digit deficit into a historic comeback, rallying for an improbable 16-13 victory in the highest scoring game ever at Petco Park.

The Padres jumped out to a 12-2 lead after five innings, but the Mariners used a five-run sixth and a nine-run seventh to notch the largest come-from-behind win in franchise history — and the first 10-run comeback in the Majors since the A’s overtook the Twins on July 20, 2009.

The Mariners sent 13 men to the plate in the seventh and used seven consecutive two-out singles to overtake the Padres — whose 10-run edge was the largest they’ve ever squandered. During that stretch, Stefen Romero drove home the tying run before Shawn O’Malley put the Mariners on top for good with a knock up the middle off San Diego reliever Matt Thornton.

The Padres did the bulk of their damage in a seven-run fifth inning, during which they chased Mariners lefty Wade Miley. With a 5-for-6 night, center fielder Jon Jay became just the fourth Padres hitter in history to record consecutive four-hit games — joining Tony Gwynn, Reggie Sanders and Cameron Maybin. He also joined Gwynn as the only Padres with nine hits over a two-game span.

But it wasn’t enough — as Seattle seemingly reversed the happenings of July 2001, when the Indians overcame a 12-run deficit in the biggest comeback in MLB history. The Mariners’ previous record for largest comeback win was eight runs, when they rallied from a 9-1 …

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