WASHINGTON — Brandon Belt homered off Tanner Roark in the 18th inning to lift the Giants to their 10th consecutive postseason victory, a 2-1 win over the Nationals on Saturday night that gave them a 2-0 lead in the NL Division Series.
It tied the mark for most innings in a postseason game and set a time record at 6 hours, 23 minutes, 33 minutes more than the previous longest game, ESPN Stats and Info said.
Down to their final out in the ninth, the wild-card Giants tied it on Pablo Sandoval's RBI double, then saw Nationals manager Matt Williams and second baseman Asdrubal Cabrera ejected in the 10th.
Yusmeiro Petit entered in the 12th and threw six scoreless innings, allowing one hit and striking out seven, to earn the win. Hunter Strickland got the save.
Game 3 is Monday in San Francisco. Ace left-hander Madison Bumgarner is scheduled to start for the Giants.
Belt, who had been 0-for-6, fell behind Tanner Roark 0-and-2, then worked the count to 3-and-2 before cranking one an estimated 413 feet into the rightfield seats.
Washington starter Jordan Zimmermann took a three-hitter and a 1-0 lead into the ninth inning. He was pulled after a two-out walk to Joe Panik, and reliever Drew Storen gave up a single to Buster Posey and the RBI double to Sandoval. Panik scored on Sandoval's hit, but Posey was thrown out at the plate, a call that was upheld on a video review.
The Nationals scored on an RBI single by Anthony Rendon in the third inning.
The 18 innings matched the longest in playoff history. The Astros beat the Braves 7-6 in 18 in the deciding Game 4 of the 2005 NLDS. Tim Hudson, San Francisco's starting pitcher Saturday, was Atlanta's starter in that game.
Posey had a single in the first, Hunter Pence had one in the second and Travis Ishikawa had one in the third, but once the Nationals took the lead, Zimmermann locked in. He retired 20 of the final 21 Giants he faced, throwing seven pitches in the fourth, nine in the fifth, 12 in the sixth and seven in the seventh to cruise into the ninth on 88 pitches.
Cabrera and Williams were ejected with one out in the 10th. Cabrera threw down his bat and his helmet after a called third strike by umpire Vic Carapazza. Cabrera yelled at the ump and was ejected.
That's when Williams went over, pushed Cabrera away and started arguing with Carapazza, brim-to-brim, before also getting kicked out of the game.