Australian Open: Surprise upsets of week one

Defending champion Novak Djokovic was knocked out in four hours and 48 minutes by world No 116 Denis Istomin in the second round, losing 7-6 (10-8), 5-7, 2-6, 7-6 (7-5), 6-4. It was the first time that Djokovic had been beaten in the second round of a Grand Slam since Wimbledon 2008. (AFP image)

Andy Murray's hopes of winning a first Australian Open title ended with a shock defeat to world number 50 Misha Zverev. Murray, the world No 1, dropped serve eight times as his German opponent won 7-5, 5-7, 6-2, 6-4 in the upset of the season. (Reuters)

A few hours after Murray's exit, the defending champion and world No 2 Angelique Kerber was beaten in the fourth round by unseeded Coco Vandeweghe, ranked 35 in the game. German Kerber, 29, won Grand Slam titles at Melbourne and New York last year, but went down to Vandeweghe 6-2, 6-3. (Getty Images)

Britain's Dan Evans, ranked 51, came from a set down to upset seventh seed and former US Open winner Marin Cilic 3-6 7-5 6-3 6-3 in the second round. This was the 26-year-old's biggest career victory, and came after he struggled with an eye problem while Cilic breezed through the first set in 31 minutes. (Getty Images)

The British No 3's next victim was the home favorite Bernard Tomic, a victory which put him into the last 16. Evans beat the 27th seed 7-5, 7-6, 7-6 in two hours and 48 minutes in another great display of his handskills, holding his nerve in both tiebreakers. There was even arguments with the officials after a rain shower disrupted play at a crucial time in the third set. (Getty Images)

This was a high-intensity match which Italian Andreas Seppi won, but made headlines for yet another Nick Kyrgios meltdown that sent him crashing out of the tournament. Perennial bad boy Kyrgios was accused of tanking, or giving up, during his 1-6, 6-7 (1/7), 6-4, 6-2, 10-8 loss to Seppi. Australian Kyrgios won the first two sets, then lost two, before the final went back and forth in riveting manner. (Getty Images)