What was your favourite moment of day four?
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1 / 10
Serena Williams crashed out in the third round of the women's singles.
2 / 10
China's Weng Dei broke the world record to win gold in the women's 63kg.
3 / 10
Simone Biles landed the first of a possible five Olympic gymnastic golds in Rio.
4 / 10
Rafael Nadal (L) and Marc Lopez celebrate their Men's Doubles Quarterfinals win.
5 / 10
Katie Ledecky of the USA won the gold medal in the final of the Women's 200m freestyle.
6 / 10
Ryan Lochte during the Men's 4 x 200m Freestyle Relay Final.
7 / 10
Phelps celebrates with his family after winning the Men's 200m Butterfly Final to claim his 20th gold medal.
8 / 10
Eddie Redmayne watches the women's 200m Individual medley.
9 / 10
China's Chen Ruolin and Liu Huixia claimed gold in the women's synchronized 10 metre platform diving event.
10 / 10
David Oliver Joyce was no match for Albert Selimov.
