The 2011 NBA Playoffs saw a pair of upsets on Sunday, amazingly with both the No. 1 and No. 2 seeds in the Western Conference losing.

The top-seeded San Antonio Spurs lost 101-98 to the Memphis Grizzles. For the Grizzles, it marks their first playoff victory - ever. The Grizzles were led by Zach Randolph's double-double, scoring 25 points and grabbing 14 rebounds en route to the Vancouver Memphis Grizzles' first ever playoff win.

The Western Conference madness didn't stop there as the Lakers fell to the Hornets, 109-100. Chris Paul scored 33 points while dishing out 14 assists and again reminded America, or those who bothered to watch the game, why he's so highly regarded. Kobe Bryant did score 34 for the Lakers, but it wasn't enough. 

The Knicks almost continued the upset trend on Sunday, but Ray Allen's three pointer in the waning seconds of regulation led the Celtics to an 87-75 victory over New York. Carmelo Anthony had a chance to either tie or win it for New York, but settled for a strange (read: bad) shot with a few seconds still on the clock and Boston came away with the win.

Oklahoma City avoided an upset as well, thanks in large part to Kevin Durant. The Thunder beat the Nuggets 107-103 behind Kevin Durant's 41 points and nine rebounds.

The 2011 NBA Playoffs continue tonight with two games: the Heat take on the 76ers and the Bulls take on the Pacers.