From Jimmy Butler taking on LeBron James in a head-to-head matchup to Nate Robinson responding to a bloody lip with a second-half scoring outburst, in Game 1 of the Eastern Conference semifinals, the Bulls played their trademark blue-collar brand of basketball to perfection Monday night at American Airlines Arena.

But in the end, in order to pull off the unthinkable, a 93-86 series-opening upset win, a heavy dose of Robinson fourth-quarter heroics were necessary.

Slow offensive starts by both teams were the order of the evening, but while the Heat went 0-for-7 at the outset of the contest, the Bulls, propelled by Joakim Noah (13 points, 11 rebounds), built an early cushion.

However, two quick fouls on Noah midway through the opening period put a damper on things, as did Miami gradually closing the gap.

The hosts appeared to be rusty after a long layoff following their first-round series sweep of Milwaukee and the undermanned Bulls capitalized as best as they could, with Butler (21 points, 14 rebounds), matched up with league MVP James (24 points, eight rebounds, seven assists)—he was presented with the trophy by NBA commissioner David Stern prior to the contest—making contributions on both ends, they again obtained some breathing room, despite Carlos Boozer also picking up a pair of early fouls.

A lift off the bench from big men Taj Gibson (12 points) and Nazr Mohammed furthered the visitors’ cause and after a quarter of play, the Bulls held a 21-15 advantage, following Heat backup point guard Norris Cole’s buzzer-beating floater.