This article was written by Garrett Evans based on reporting from The Associated Press.
Sunday's Olympic Games were marked by comebacks and career breakthroughs, as well as record-setting gold medal wins.
U.S. track-and-field runner Sanya Richards-Ross came back from a disappointing run four years ago to claim the gold in the 400-meter race. Serena and Venus Williams also won the gold for the U.S. in women's doubles.
Britain* gained another gold Sunday as Andy Murray defeated Roger Federer in men's tennis, marking a career breakthrough win. Usain Bolt of Jamaica also claimed a gold medal Sunday for a record-breaking 9.63-second run in the 100-meter race.
Serena, Venus Williams claim women's tennis gold
The Williams sisters beat Andrea Hlavackova and Lucie Hradecka of the Czech Republic 6-4, 6-4 on Sunday at the All England Club in Wimbledon.
Including the doubles win, Serena now has claimed two golds at the London Games. She defeated Maria Sharapova in singles for her first gold of the games Saturday.
Serena's double gold-medal win is the first in Olympic tennis since her sister Venus did the same at the Sydney Games in 2000.
U.S.' Sanya Richards-Ross wins track-and-field gold
After a disappointing bronze medal run four years ago in Beijing, the United States' Sanya Richards-Ross won a gold Sunday in the 400-meter track and field race. She gave the U.S. its first track-and-field gold medal of the London Olympics.
Richards-Ross crossed the finish line in 49.55 seconds, about a full body length ahead of defending champion Christine Ohuruogu of Britain. Ohuruogu finished with a time of 49.70, claiming the silver. DeeDee Trotter of the U.S. won bronze, finishing with a time of 49.72.
Andy Murray is first British man to win Olympic men's singles since 1908
Andy Murray won the gold in men's singles tennis Sunday — the first British man to do so in 104 years. Josiah Ritchie was the last to win the gold for England during the men's singles final at the 1908 Summer Olympics, also held in London.
Murray defeated Swiss player Roger Federer 6-2, 6-1, 6-4, marking a career breakthrough win. Murray had lost all four of his Grand Slam finals earlier — three against Federer — including the Wimbledon final in July.
Federer went home with silver, his first singles medal. "Don't feel too bad for me," he said, according to AP. "I felt like I won my silver, I didn't lose it. So I feel really happy."
Jamaica's Usain Bolt breaks Olympic record
Usain Bolt of Jamaica won his second Olympic gold medal Sunday during the men's 100 meters final.
He also broke an Olympic record — finishing the race in 9.63 seconds.
Yohan Blake, Bolt's training partner, also of Jamaica, took home silver, finishing in 9.75 seconds. Justin Gatlin of the U.S. finished third, taking home bronze with a time of 9.79 seconds.
After Sunday's competition, China leads the U.S. in gold and total medals.
At the games: Olympic organizers impress fans with more than sports
Although it might be over the top for some, games attendees are appearing to respond well to the entertainment provided at every Olympic venue.
So far, this entertainment has consisted of Eastern European cheerleaders, English ballet dancers, U.S. pop singers, British marching bands and acrobatic acts from all over the world.
According to AP, British spectator Rebecca Hester said, "It's absolutely marvelous; I love the whole atmosphere. Not just the sports, but everything."
Monday's games: What to watch
To view the full schedule for Monday's games, visit NBC's Olympic website.
8 a.m. CDT: Men's gymnastics rings final
8:50 a.m.: Women's gymnastics uneven bars final
1 p.m.: Men's quarterfinal beach volleyball, U.S. vs. Latvia
1:45 p.m.: Women's soccer semifinal, U.S. vs. Canada
2 p.m.: Men's volleyball, U.S. vs. Tunisia
2:45 p.m.: Men's 400m hurdles final
4:15 p.m.: Men's basketball, U.S. vs. Argentina
Find complete coverage of the London 2012 Summer Olympics from The Associated Press at http://summergames.ap.org/columbiamissourian.
Supervising editor is Frank Russell.