The outfielder enters Wednesday's action with 55 doubles - five away from becoming only the 6th player ever to collect 60 in a season and the first to accomplish the feat in 83 years. However, Castellanos admits the mark isn't on his mind.
"Not really," he said, according to Paul Sullivan of the Chicago Tribune. "Why should I?"
He added, "Do you think Chicago would rather me get this record and we lose and then we don't make the postseason?"
Castellanos has been a hitting machine since joining the Cubs via a deal with the Detroit Tigers at the trade deadline. Since July 31, he's slashing .333/.366/.678 with 15 home runs and 38 RBIs in 44 contests. The 27-year-old owns a 1.184 OPS in 22 games at home.
"It's Wrigley Field," he said. "I like it. Hitting-wise it's a great park to hit in. I mean, any park is a great park to hit in compared to where I came from, you know?"
Castellanos only mustered three homers and 17 doubles this season at Detroit's Comerica Park.
The soon-to-be free agent also revealed that he hasn't talked with the Cubs' front office about his future with the club.
"There have been no discussions or anything past this season because I think, just like myself, they're focused on winning," Castellanos said.
The Cubs (82-69) are tied with the Milwaukee Brewers for the NL's second wild-card spot.