ST. LOUIS—Nationals' manager Dave Martinez was awake most of the night after Washington lost on a walk-off grand slam Sunday.
He likely won't be catching up on that missed sleep anytime soon.
Paul DeJong handed the Nationals their second-straight walk-off loss—capping a back-and-forth finish with a game-ending solo homer in the ninth inning of the St. Cardinals' 7-6 victory last night.
DeJong took Koda Glover (0-1) deep leading off the ninth on a 3-1 pitch.
A night earlier, Ryan Madson allowed a game-ending ninth-inning grand slam to the Chicago Cubs' David Bote in a 4-3 defeat.
“I don't sleep most nights, I like to watch replays of the game,” Martinez said.
“And last night [Sunday] was no different.”
Washington's bullpen has blown saves in three of its past four games.
All-star closer Sean Doolittle has been on the disabled list since early July while top set-up man Kelvin Herrera went to the DL with right rotator cuff impingement last week.
“I don't know what else to do,” Martinez said of the bullpen.
The usually stoic DeJong wasn't quite sure how to celebrate his first career walk-off homer. He started calm, keeping his head down as he rounded the bases.
After coming around third, though, he whipped his helmet into the grass, threw his arms down, and bellowed out a roar.
“My first walk-off," DeJong noted. "It felt so good, I had to do something a little different.”
The Cardinals recorded their 10th walk-off win of the season and DeJong became the sixth different player to end a game in grand fashion.
“They're all special, all emotional," said St. Louis interim manager Mike Shildt. ”These guys have the mentality, 'Do your job, keep the line moving.'
“They have a lot of trust with each other.”
The Cardinals have won six in a row and moved to nine games over .500 for the first time this season.
DeJong's 380-foot drive ended a wild final two innings.
Matt Carpenter and Jedd Gyorko homered in the eighth inning to put St. Louis up 6-4.
Gyorko started the rally with a lead-off drive, then Carpenter followed with a three-run homer off Sammy Solis.
The Nationals tied it at 6-6 in the top of the ninth on RBI singles by Daniel Murphy and Matt Wieters off closer Bud Norris.
Dakota Hudson (3-0) relieved Norris and stranded two runners by retiring Wilmer Difo and Adam Eaton.
Juan Soto and Bryce Harper homered for the Nationals, who now have lost five-of-seven.
Elsewhere in the NL, San Francisco beat L.A. 5-2 while Atlanta swept a doubleheader from Miami, winning 9-1 and 6-1.
The N.Y. Mets topped the N.Y. Yankees 8-5, Cleveland dumped Cincinnati 10-3, Texas beat Arizona 5-3, and the L.A. Angels doubled San Diego 6-3 (10 innings) in interleague play.