The Cavaliers became the first team to advance to the second round of the playoffs by completing their sweep of the Pacers, and the Rockets went up 3-1 on the Thunder despite a sub-par game from James Harden.
The Celtics, meanwhile, got a second straight win on the road to even their series with the Bulls, while the Jazz beat the Clippers without Gordon Hayward, who was sidelined after just nine minutes due to a bad case of food poisoning.
Here are four things we learned from Sunday's four-game slate of NBA playoff basketball.
The Bulls and the Celtics don't like each other
Boston caught a huge break in this series when Chicago's Rajon Rondo was lost after Game 2 with a fractured thumb. The Bulls had seized a 2-0 series lead with Rondo running the point, and without him, the Celtics won two straight in Chicago to take control right back.
And now that the series is a true fight, we're seeing some chippines start to creep in.
A seemingly minor second-quarter dust-up between Jimmy Butler and Marcus Smart irked Butler enough for him to rip Smart afterward, claiming he "isn't about that life," while essentially warning him to knock it off with the fake-tough-guy act.
Then Butler's head coach, Fred Hoiberg, took a shot Boston's Isaiah Thomas, claiming it's impossible to guard him when the refs are allowing him to "discontinue his dribble" on every possession. Thomas fired back, and now we get (at least) two more games between these two teams where the words exchanged afterward might be more entertaining than the contests themselves.
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The Rockets can win in the playoffs without James Harden's dominance
James Harden played in Game 4 against the Thunder with an ankle injury that noticeably impacted his performance. After looking unstoppable in the first three games of the series while averaging 38.6 points per game, Harden managed just 16 points on 5-of-16 shooting on Sunday, while committing seven turnovers and missing all seven of his looks from three-point distance.
But the Rockets got a huge lift from their bench, and that was ultimately the difference. Lou Williams and Eric Gordon chipped in 18 apiece, and Nene set an NBA playoff record for perfection by going 12-of-12 from the field on the way to a 28-point, 10-rebound performance in just 25 minutes on the floor.
Houston was already looking like one of the scarier teams out West. If the Rockets can find a way to win in the playoffs even when Harden has a bad game, they may be more of a threat than we ever imagined.
Joe Johnson may have saved Utah's season
Heading into Sunday's Game 4 at home, the Jazz trailed the Clippers two games to one in the series. While Rudy Gobert was back in the lineup for the first time since suffering a knee injury seconds into Game 1, Gordon Hayward was attempting to play through food poisoning, and scored just three points in nine minutes before the illness forced him to call it a night.
The Clippers seemingly had an easy path to seize control of the series with Utah's leading scorer out of action. But Joe Johnson -- 35 years old and playing in his 16th NBA season -- made sure that wouldn't be the case.
Johnson finished with a game-high 28 points on 12-of-18 shooting, to go along with five rebounds and five assists in 35 minutes off the bench. Utah got contributions from plenty of others to secure the victory, but without Johnson's steady and efficient dose of offensive firepower, they wouldn't have had a shot.
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LeBron James is becoming the greatest of all time right before our eyes
LeBron has never lost a first-round playoff series in his entire career, while appearing in the postseason for 12 consecutive years. He's swept opponents more times in a seven-game series now than any other player in NBA history, and he's 52-0 all-time in the playoffs when taking a double-digit lead into the fourth quarter.
LeBron will almost certainly pass Michael Jordan to become the all-time leading scorer in playoff history this season. If he can add one or two more rings to what's already a Hall of Fame résumé, there won't be much of a credible argument to be made against him holding the title of the game's greatest player. He's getting closer and closer as the numbers just keep piling up, with seemingly no end in sight.