With one swing, Adilson da Silva of Brazil put golf back into the Olympics for the first time in more than a century. It took less than a minute for defending Olympic judo champion Kayla Harrison to defeat her first-round opponent. And an Olympic walking champion was banned for eight years for doping just days before he hoped to compete in Rio.
Here are some notable figures from Day 6:
1st: First hole-in-one in Olympic golf history. Justin Rose, one of the best-known men's golfers, hit it on the 191-yard, par-3 fourth hole in the first round of the men's golf tournament. The 36-year-old Englishman is one of the few top golfers competing in Rio with several pulling out over Zika virus concerns.
2: The number Olympic boxers who were released from prison after being arrested on allegations of sexual assault. Rio organizing committee spokesman Mario Andrada said Jonas Junius of Namibia and Hassan Saada of Morocco were released from police custody on Thursday morning. He said "that doesn't mean the legal process is over" but that Junius "is able to compete."
8: Years that former Olympic race walking champion Alex Schwazer was banned after losing another doping case days before he hoped to compete in Rio. The Court of Arbitration for Sport said Thursday it has imposed an eight-year ban on the 31-year-old Italian in a fast-track case after an appeal hearing held Monday. Schwazer, the 2008 Olympic champion in the 50-kilometer walk, now misses a second straight Summer Games for doping.
8:12.86: The time it took Katie Ledecky to swim the 800-meter freestyle in the preliminaries. Her time was nearly seven seconds faster than anyone else, setting an Olympic record. She's swimming in the final on Friday. This week, Ledecky also smashed her own world record in the 400m freestyle, finishing in 3:56.46.
21: The total number of gold medals that were up for grabs in 11 sports on Thursday at the Rio Olympics, with high-powered performances expected from American stars Michael Phelps and Simone Biles.
22: The number of gold medals Michael Phelps has won after his Thursday victory in the 200 meter individual medley.
43: The number of seconds it took American judoka Kayla Harrison to beat China's Zhang Zhehui in the opening bout as she attempts to defend her 2012 Olympic gold medal. But Harrison's biggest rival was even faster. Brazil's Mayra Aguiar won her first round in 39 seconds. Harrison and Aguiar are expected to meet in the final later in the afternoon.
112: Years since golf was last an Olympic sport. Adilson da Silva of Brazil, who learned to play using tree branches for clubs, was chosen to hit the opening tee shot at the Olympic Golf Course in a proud moment for the sport. Not since 1904 in St. Louis has an Olympic medal been awarded in golf. The sport has come under scrutiny because six of the top 10 players in the world chose not to play.
2,000: The numbers of drug tests conducted so far at the Olympics, with no positive case as yet reported, according to the International Olympic Committee.