Sunday's NBA schedule brought an occurrence rarer than a quadruple-double (that's happened only five times in NBA history, by the way).

The four games on the slate all featured teams with winning records. According to the Elias Sports Bureau, that's only the second day in NBA history every team on a schedule of at least four games had a winning record entering the day. The only previous date came on March 23, 2008.

That's a refreshing change from a late-season schedule that usually seems to feature two or three games pitting one of the NBA's half-dozen or so elite teams against a team looking to end up with the No. 1 draft choice.

But on a day where everyone entered a winner, four teams had to go home losers. Here are a few lessons we learned:

— The Thunder snapped the Raptors' 11-game winning streak, 132-125, as Russell Westbrook notched his fifth-consecutive triple-double. But trouble broke out in the game's final minute, as the strained relations between NBA players, coaches and referees once again became an issue. Raptors DeMar DeRozan, Serge Ibaka and coach Dwane Casey were ejected for complaining to the refs. That led to the referees needing a security escort as they left the floor.

— Trail Blazers star Damian Lillard had said he expected he would play the entire game against the Clippers Sunday, even if his girlfriend went in to labor (their son is due March 19). Lillard's baby boy held off his arrival long enough for the Portland guard to score 23 points to key a 122-109 victory. In case you missed this statistical nugget from a couple of days ago, Lillard is one of only four players in NBA history with at least 10,000 points and 2,800 assists in their first six seasons. The other three are Oscar Robertson, Nate Archibald, and LeBron James. Lillard, not to mention backcourt mate C.J. McCollum, will make the Trail Blazers (44-26) a tough out in the playoffs.

— The Pelicans whipped the visiting Celtics, 108-89. Anthony Davis had a huge game for the Pelicans (40-30), with 34 points and 11 rebounds. Everyone knows James Harden is the prohibitive favorite to win the MVP award this season, and the usual suspects (LeBron, Steph, KD) will get their share of votes. But it's hard to argue any of those players are more valuable to their team than AD is to the Pelicans. This was a huge win for the Pelicans, moving them two games ahead of the Nuggets in the race for the final playoff spot in the West. The Celtics (47-23) are virtually locked into the No. 2 seed in the East, five games behind the Raptors, and 6 1/2 ahead of the Cavaliers.

— The Rockets beat a tough Timberwolves team in Minnesota, 129-120. After seeing their 17-game win streak snapped March 9, the Rockets (56-14) have now won five in a row. Harden had his usual big game (34 points, 12 assists), but Houston had seven players in double figures. Even if someone figures out a way to stop Harden — which hasn't happened yet — the Rockets have a lot of offensive weapons. On the other side, every game counts now for the Timberwolves (40-31), who are fighting for a playoff spot.

Stud of the Night

Russell Westbrook could occupy this spot a couple of times a week, so in fairness to other NBA players, we often overlook some great Westbrook stat lines to mention other players here. But really, Westbrook's numbers Sunday (37 points, 14 assists, 13 rebounds) were ridiculous.

Dud of the Night

Raptors forward Serge Ibaka made only two field goals, had three turnovers and was ejected in the Raptors loss to the Thunder.

Highlight

Final seconds of a close game, Thunder have the ball … say, Russell Westbrook might be a good option!