The Boston Celtics beat the Indiana Pacers 110-106 to seal a series sweep and become the first team to advance to the second round of the NBA play-offs.
Gordon Hayward racked up 20 points, three rebounds and two assists as his side came from behind at half-time to wrap up their first 4-0 series win in eight years.
Marcus Morris and Jayson Tatum also dominated for the visitors, both finishing with 18 points.
The Celtics will go on to face either the Milwaukee Bucks or the Detroit Pistons, with the Bucks leading their series 3-0.
The Golden State Warriors, meanwhile, moved within one win of clinching their first-round play-off series with a 113-105 victory over the Los Angeles Clippers.
Kevin Durant poured in 33 points and Klay Thompson finished not far behind on 32 points to earn the Warriors a 3-1 series lead.
The Portland Trail Blazers head home to the Moda Centre with a 3-1 series lead after a 111-98 win over the Oklahoma City Thunder.
CJ McCollum top-scored for Portland with 27 points, while Damian Lillard added 24, scoring 15 points in the third quarter alone.
In the night's other game, the Toronto Raptors edged towards the second round with a 107-85 win over the Orlando Magic.
Kawhi Leonard finished with 34 points to lead his side to a 3-1 series lead ahead of game five on Tuesday at the Scotiabank Arena.
