Though Nationals manager Dusty Baker said he expected his third baseman to be OK following the loss, Rendon's neck was still sore when he showed up to the clubhouse at Marlins Park Tuesday. Rendon was available off the bench only in an emergency for their game against the Marlins.
"Just didn't want to take a chance. That neck lingered," Baker said. "We'll check and see how he's doing tomorrow."
Baker declined to provide any specific details as to which baseball activity most bothers Rendon's neck at this point. He was also unsure if Rendon could play in the final game of the series Wednesday, an early 12:10 p.m. ET start in Miami.
Rendon injured his neck while diving to his left for a hard ground ball off the bat of Giancarlo Stanton in the third inning of Monday's loss.
One and a half innings later, he was pinch-hit for by Stephen Drew, who stepped in by going 2-for-3 with an RBI.
Unaware of any specific treatment Rendon was receiving, Baker said the club's training staff was working on him diligently prior to Tuesday's game.
"He just said it was sore," Baker said. "They're working on him. We've got about 100 hands back there."
One of the Nats' most productive hitters, Rendon has played in 65 of the club's 70 games this season. His solo home run Monday night gave him 13 homers and 45 RBIs on the season, which rank third and fourth on the team, respectively.
Rendon had also been hot at the plate over the past five games. The fourth-place vote-getter in the Esurance MLB All-Star Game Ballot fan vote for National League third basemen is hitting .412 with two homers, two doubles and six RBIs during that span.
The Nationals and 12th-round Draft pick Jackson Stoeckinger agreed on a deal for $175,000, per MLB.com's Jonathan Mayo. The deal means $50,000 will count toward Washington's bonus pool.
Stoeckinger, a left-handed pitcher out of the College of Central Florida, had a solid season coming off Tommy John surgery a year ago. He struck out 38 in 32 2/3 innings, and owned a 4.96 ERA for the Patriots.
Patrick Pinak is a reporter for MLB.com based in Miami.