Nationals third baseman and top prospect Anthony Rendon arrived at Citi Field at 9:50 a.m. ET on Sunday, and manager Davey Johnson immediately placed Rendon sixth in the starting lineup against the Mets. The Nationals called up Rendon from Double-A Harrisburg after placing third baseman Ryan Zimmerman on the 15-day disabled list.

"We get a guy who is a natural third baseman, who will defend," general manager Mike Rizzo said. "He had a good Spring Training and is having a good start to the season. It will be a chance to perform at the big league level. We'll evaluate [him] at the big league level, and Davey is never afraid to give a young player a chance and to play him. He has never been afraid to do that. As an organization, we have never been afraid to do that.

"Rendon is a guy who we think is going to be a long-term part of the organization. We thought it was a good time until Zim gets back full-time. Plus, it also strengthens our bench by not having Chad Tracy and Steve Lombardozzi platooning out there."

Rendon, 22, played 14 games for the Senators this year and hit .292 with two home runs, seven RBIs and a .462 on-base percentage.

"He is a natural baseball player," first-base coach Tony Tarasco said. "His swing is easy. His attitude is mellow and even. First appearances are quite deceiving. When you look at him, it's not like he is 6-foot-5, 245 [pounds]. The guy is 5-foot-11, 185, 190, and the ball jumps off his bat like he is 6-foot-5, 245. He has a sweet swing. He makes adjustments from at-bat to at-bat. He is a natural out on the field. He has a great glove. It comes effortless for him."

Asked if he was ready to play in the big leagues, Rendon said, "There is only one way to find out and that's to be here. I'm pretty confident, I'm a confident person -- at least I try to be. I try to do the best I can in everything I do, so we'll see how it plays out."