Jimmy Butler said he has been too focused on his offense as the Chicago Bulls fell to the Milwaukee Bucks on Monday.

"I have," Butler said. "I'll stay on us about it. I'm supposed to be the prime-time defensive guy, and I haven't been guarding a soul. I've been worried about offense too much, and I need to change that quickly or it's going to be my fault."

Butler almost racked up a triple-double in Monday's loss with 20 points, 10 rebounds and six assists, but he was just 5-for-21 from the field in 46 minutes of play. He is averaging 44.2 minutes per game in the series.

"I think they just played harder than we did," Butler said. "On both ends of the floor. End of story. They played harder than we did."