9 a.m. on 5, 8, ‘‘2013 U.S. Open Golf Championship’’ — There’s a champion to be determined today at Merion Golf Club in Ardmore, Pa., where golfers tee off in the final round of the U.S. Open. Webb Simpson donned that crown a year ago, as he birdied four holes around the turn and converted a tough chip out of a hole into a par on the final day to register a one-stroke victory over Graeme McDowell and Michael Thompson.

10 a.m. on TNT, ‘‘NASCAR Racing’’ — Dale Earnhardt Jr. no doubt has fond thoughts of Michigan International Speedway, home of today’s Quicken Loans 400. It was a year ago here on the 2-mile D-oval that he snapped a 143-race Sprint Cup winless streak, beating Tony Stewart to the finish line by a comfortable 5.4 seconds to rack up his only win of 2012. He’ll be opposed this year by a field including Stewart, Jimmie Johnson, Carl Edwards, Matt Kenseth and Ryan Newman.

10:30 a.m. on TBS, ‘‘MLB Baseball’’ — Two National League clubs with postseason aspirations clash today in Pittsburgh, where Andrew McCutchen and the Pirates conclude a three-game series against Adrian Gonzalez and the Los Angeles Dodgers. While the Pirates look to be on track to break a 20-year streak of sub-.500 records this year, the Dodgers appear to be doomed to that fate, done in mainly by an inability to score runs. The Bums did, however, sweep the Bucs when these teams met in April.

5 p.m. on ESPN, ‘‘MLB Baseball’’ — Two National League playoff hopefuls go at it tonight in Atlanta, where Justin Upton and the Braves close out a three-game series against Buster Posey and the San Francisco Giants of the West. The defending world champs got the better of the East-leading Braves when these teams met in San Francisco a month ago, taking three of four in decisive fashion.

8 p.m. on 10, ‘‘The Simpsons’’ — Marge shocks Homer by telling him she’s unhappy with her new car because it would be too small if there’s an addition to the family. Lisa has a secret involving cryptic messages and covert meetings downtown, and Bart is determined to find out what’s up in ‘‘Adventures in Baby Getting.’’ NASCAR driver Jeff Gordon voices his cartoon likeness.