5. LONDON OLYMPICS: Michael Phelps retired from swimming after setting an Olympic record with his 22nd medal at a Summer Games bursting with memorable performances. Usain Bolt became the first man to successfully defend both the 100- and 200-meter dash titles. And the host country racked up 65 medals in an Olympics so successful for Britain that it barely even rained.
6. COLLEGE FOOTBALL PLAYOFFS: Instead of complaining about the BCS, soon we can moan about the selection committee. After years of carping, fans finally got a playoff system, which will debut after the 2014 season. The four-team bracket will feature semifinals and a title game to determine a national champion.
7. REPLACEMENT OFFICIALS: Fans and pundits predicted a blown call would decide a critical game when the NFL started the season with replacement officials. Sure enough, in Week 3, on the national stage of "Monday Night Football," a missed offensive pass interference penalty and a questionable touchdown catch handed the Seattle Seahawks a win over the Green Bay Packers. Two days later, the league resolved its labor dispute with the regular refs.
8. SUPER GIANTS: A team that had been 7-7 upset the top-seeded Green Bay Packers on the road in the playoffs, needed overtime to beat the San Francisco 49ers in the NFC title game, then came from behind to defeat the New England Patriots in the Super Bowl, 21-17, an outcome strangely similar to their matchup four years earlier. Eli Manning won his second Super Bowl MVP award.
9. SUMMITT RETIRES: Pat Summitt, the winningest coach in NCAA basketball history, retired from the Tennessee bench in April at age 59, less than eight months after revealing she had early-onset dementia. Longtime assistant Holly Warlick took over the Lady Vols. Summitt was 1,098-208 with eight national titles in 38 seasons.
10. MANNING'S RESURGENCE: Peyton Manning was released from the Indianapolis Colts in March after missing last season because of neck surgery, the future uncertain for the four-time MVP. John Elway and the Broncos gambled that he still had some championship play left in that right arm, and so far it's looking like a brilliant move as Denver won the AFC West.
AP Projects Editor Brooke Lansdale contributed to this report.