Weekend watchdog

Going into the Kentucky Derby, all the horses have a chance of winning the Triple Crown.
Saturday in Baltimore, only one still has that chance.
Kentucky Derby winner Super Saver leads the field into the Preakness Stakes on NBC. Coverage starts at 4:30 p.m., and a few hours later we'll know if the Belmont Stakes really matters this year.
Also in Baltimore this weekend, the Orioles host Cleveland on MASN. The Nationals are in Colorado on MASN2.
The Phillies' visit to Milwaukee will be seen Saturday afternoon on FOX and Sunday night on ESPN. Other FOX choices are Seattle at Tampa Bay and Astros-Giants. Sunday afternoon, TBS will show the Twins' visit to the Yankees.
While the NBA season winds down, the WNBA kicks off its season Saturday afternoon on ESPN2 as Los Angeles meets Phoenix. In the NBA playoffs, the Boston Celtics visit Orlando Sunday at 3:30 p.m. to start the Eastern Conference final. LeBron James can start really thinking about where he'd like to play in 2010-11.
The fourth member of the NHL's final four will be decided Friday, when the Flyers head to Boston for Game 7 of their series. The Flyers are trying to win a seven-game series after losing the first three games, and Friday's winner plays Montreal in the Eastern Conference final.
San Jose and Chicago have advanced to the Western Conference final. NBC will cover ice hockey Sunday at 3 p.m.
The NCAA lacrosse tournament starts this weekend, and Saturday at noon ESPN shows Johns Hopkins' visit to Duke.
NASCAR heads to Dover a few weeks earlier than normal. The "Monster Mile" usually gets its visit after the Memorial Day weekend race in Charlotte, but with the holiday coming on May 31 Dover moves up to fill a hole in the schedule. FOX will be there.
The Nationwide Drivers go racing Saturday at 2 p.m. on ABC.
DC United faces the Colorado Rapids Saturday at 7:30 p.m. on Comcast.
CBS has the Valero Texas Open Saturday and Sunday, starting at 3 p.m. both days.
Comcast has college baseball Friday as Miami visits Georgia Tech at 7 p.m. Saturday afternoon, North Carolina takes on Virginia. ESPN has Mississippi vs. Alabama Saturday at 4 p.m.
The SEC crowns its softball champions Saturday at 7:30 p.m.