The Cubs (69-61) took three of four in Pittsburgh. Next up is a big three-game series against NL Central-leading Milwaukee at Wrigley Field beginning on Monday night.
Bellinger singled in Hoerner in the first inning. He doubled home two more runs in the fifth, giving Chicago a 5-1 lead. The 2019 NL MVP added another two-run double in the ninth and scored the Cubs' final run on Yan Gomes' groundout.
Bellinger has 16 RBIs in his last nine games and a MLB-best 53 RBIs since July 1. He has reached safely in 34 of his last 38 games.
The Pirates have lost nine of 10 against the Cubs this year.
Dan Scifo, The Associated Press