London: Angelique Kerber was on the brink of losing the World No 1 ranking on Saturday before the German scraped into the Wimbledon last 16 with a tense 4-6, 7-6 (7/2), 6-4 victory over Shelby Rogers.
In order to retain top spot in the WTA rankings, Kerber has to return to the Wimbledon final 12 months after losing the title match against Serena Williams.
The 29-year-old was on the verge of crashing out in the third round after losing the first set and falling a break down in the second against American World No 70 Rogers.
But Kerber, who won the Australian and US Opens last year, gamely battled back to level the match in a second set tie-break before edging through in the decider.
Kerber faces Spanish 14th seed Garbine Muguruza, another former Wimbledon runner-up, for a place in the quarter-finals.
If Kerber, who regained the top ranking from Serena in March, fails to make the final she will surrender pole position to Romania's Simona Halep or Czech Karolina Pliskova.
Milos Raonic, last year's runner-up at Wimbledon, advanced to the tournament's second week by beating 25th-seeded Albert Ramos-Vinolas of Spain 7-6 (3), 6-4, 7-5 with the help of 21 aces, including one to end it.
The No 6-seeded Canadian described his performance as "pretty clean."
He finished with more than twice as many winners, 55, as unforced errors, 26.
Raonic lost to Andy Murray in last year's final at the All England Club. Now Raonic is into the fourth round for the third time in four years.
With inputs from AFP and AP
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Updated Date: Jul 08, 2017 20:57 PM