Top seed David Ferrer was knocked out of the Abierto Mexicano Telcel in Acapulco by Alexandr Dolgopolov earlier today.
Thirty-three-year-old Ferrer had been tipped to overcome his Ukrainian opponent in relatively straightforward fashion.
However, it was Dogopolov that won through 6-4 6-4 to book his place in the quarter-finals, where he will face Robin Hasse.
World number 32 Dolgopolov has already reached the last eight at tournaments in Sydney and Rio de Janeiro this year.
| ATP Rankings | Points | ||
| 1 |  | Novak Djokovic | 16,540 |
| 2 |  | Andy Murray | 8,370 |
| 3 |  | Roger Federer | 7,695 |
| 4 | | Stanislas Wawrinka | 6,405 |
| 5 |  | Rafael Nadal | 4,990 |
| 6 |  | Kei Nishikori | 4,070 |
| 7 |  | Tomas Berdych | 3,810 |
| 8 | | David Ferrer | 3,505 |
| 9 |  | Jo-Wilfried Tsonga | 3,130 |
| 10 | | Richard Gasquet | 2,795 |
| 11 |  | Marin Cilic | 2,725 |
| 12 |  | Milos Raonic | 2,650 |
| 13 |  | John Isner | 2,585 |
| 14 |  | Dominic Thiem | 2,510 |
| 15 |  | David Goffin | 2,290 |
| 16 | | Gael Monfils | 2,130 |
| 17 |  | Kevin Anderson | 2,020 |
| 18 | | Roberto Bautista Agut | 1,935 |
| 19 | | Gilles Simon | 1,810 |
| 20 |  | Bernard Tomic | 1,670 |
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