CHICAGO (Interstat) — The Washington Nationals scored four times in the top of the 10th inning and held on to beat the Chicago White Sox 6-3 on Saturday afternoon at Guaranteed Rate Field, snapping a four-game losing streak and splitting the two-game series.

The game remained scoreless through three innings before Washington broke through in the fourth. Jake Irvin turned in a dominant start, allowing four hits over five and two-thirds scoreless innings with nine strikeouts, but the Nationals could not capitalize until the fourth. Left-hander Noah Schultz matched Irvin for much of the afternoon, striking out eight over six innings while allowing two earned runs.

Washington got on the board when Nasim Nuñez delivered a two-run single with two outs in the fourth, scoring Brady House and Daylen Lile. The Nationals had loaded the bases on two walks and a strikeout before Nuñez lined a ground-ball single up the middle. Schultz escaped further damage by getting Keibert Ruiz to ground out, but Washington held a 2-0 lead.

The White Sox threatened in the bottom of the sixth after Miguel Vargas reached on a passed ball and throwing error, but Irvin struck out three straight batters to end the inning. Washington’s bullpen took over in the seventh, with Gus Varland and Mitchell Parker each working a scoreless frame.

Chicago tied the game in the eighth. Vargas walked and Colson Montgomery was hit by a pitch to put two on with no outs. Everson Pereira singled to left, scoring Vargas to make it 2-1. After a sacrifice bunt moved runners to second and third, Chase Meidroth lifted a sacrifice fly to center, scoring Montgomery and knotting the game at 2-2.

Both teams stranded runners in the ninth. The Nationals went down in order, and the White Sox put two on with two outs before reliever Cionel Pérez struck out Montgomery to send the game to extras.

In the top of the 10th, Washington broke the tie in emphatic fashion. Curtis Mead walked to open the inning, and Luis García Jr. singled to put runners on the corners. After Brady House struck out, the White Sox intentionally walked Lile to load the bases. Jorbit Vivas struck out, but Joey Wiemer drew a walk to force in the go-ahead run. Nuñez then delivered his second clutch hit of the afternoon, a two-run single to right-center that scored García and Lile. Wiemer later scored on a groundout, and the Nationals took a 6-2 lead.

Chicago made one last push in the bottom of the 10th. Montgomery reached on a fielder’s choice and later scored on a sacrifice fly by Tanner Murray. Meidroth followed with a single, but Derek Hill grounded out to end the game.

Pérez earned the victory, improving to 2-3 after pitching a scoreless ninth inning. Jordan Leasure took the loss, falling to 2-1 after allowing four runs in the 10th. The White Sox managed only seven hits and two sacrifice flies, while the Nationals collected six hits, all singles and a double from Ruiz in the third.

The win improved Washington’s record to 12-16. The White Sox fell to 11-16. Attendance was announced at 35,174, and the game lasted 3 hours, 4 minutes.

Nuñez finished with two hits and four RBIs, including the two-run single in the fourth and the two-run single in the 10th. Irvin’s outing was his best of the young season, after he had taken losses in his previous two starts against Atlanta and Pittsburgh. His five and two-thirds innings of scoreless ball included nine strikeouts and no walks. Schultz matched him for six innings, striking out eight without a walk, but took a no-decision.

Washington’s bullpen, which had struggled at times in the season’s first month, delivered three and one-third innings of one-run relief. Varland allowed one hit in a scoreless seventh. Parker worked one and one-third innings, surrendering two runs on a hit and a walk but striking out three. Pérez shut the door in the ninth.

The White Sox bullpen also turned in strong work before the 10th. Grant Taylor, Osvaldo Bido, Tyler Davis and Jordan Hicks combined for three and one-third scoreless innings, allowing no hits and striking out five. But Leasure could not preserve the tie.

The game was the second of a two-game interleague set. Chicago won the opener 5-4 on Friday. The teams close the series Sunday afternoon at Guaranteed Rate Field.

Washington opens a three-game series at the New York Mets on Tuesday, then returns home to host Milwaukee. Chicago hosts the Los Angeles Angels for a three-game set beginning Monday, then travels to San Diego.

The Interstat game simulator had projected a final score of Washington 5, Chicago 4. The Interstat ELO system gave the White Sox a 50.70 percent probability of winning. Chicago had been installed as a pregame favorite with a spread of minus 1.5.