Heavyweight boxing champion took on his toughest challenge yet as he faced up to American swimming legend in the pool
Phelps is the most decorated Olympian ever with 23 gold medals - the next highest total is just nine.
2. UFC veteran Nick Diaz arrested on domestic violence charge
Diaz senior last fought when losing to Anderson Silva at UFC 183 on January 31 2015. 
The result, though, was changed to a no-contest as Silva tested positive for performance-enhancing drugs and Diaz tested positive for marijuana.
3. Gennady Golovkin versus Canelo Alvarez ‘to take place in September’ once Mexican completes drugs ban
Canelo's promoter Oscar Del La Hoya told fellow boxing legend 'Sugar' Ray Leonard the news at an event in California.
The first fight between Canelo Alvarez and Golovkin ended in a controversial draw.
Source- TheSun:
1.https://www.thesun.co.uk/sport/6383947/anthony-joshua-michael-phelps-us-holiday-olympics-boxing/
2.https://www.thesun.co.uk/sport/6381955/ufc-star-nick-diaz-arrested-on-alleged-domestic-violence-charge/
3.https://www.thesun.co.uk/sport/6373292/gennady-golovkin-versus-canelo-alvarez-to-take-place-in-september-once-mexican-completes-drugs-ban/
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