Kei Nishikori (JPN) vs.  Juan Martin Del Potro (ARG)
Del Potro led their head-to-head 4:0 coming into this match; however, it has been over four years since their last encounter. A lot has changed for both players. Would he continue his dominance today over the much improved Nishikori or would Nishikori find a way to turn the tables on the resurgent Argentinian? Del Potro seemed a tad slower today and Nishikori, completely rested, took full advantage to get his first win 7-5, 6-4.
ISNER STILL UNABLE TO SOLVE THE MURRAY PUZZLE
 Andy Murray (GBR) vs.  John Isner (USA)
Isner’s season has been plagued by injury and spotty results, a victory today would go a long way towards salvaging the season ; however, it was a tall ask as he had never beaten Murray in six previous attempts. Today was a blow-out, it was the worst showing by Isner in all their encounters. Murray won 6-1, 6-3 and advances to the semifinals; his plans of reaching number one at the end of the season still viable.
BNP Paribas WTA Finals Singapore
The semifinals are set for both the doubles and singles.
SINGLES:  Angelique Kerber (GER) vs.  Agnieszka Radwanska (POL)  Dominika Cibulkova (SVK) vs.  Svetlana Kuznetsova (RUS)
DOUBLES:  Caroline Garcia/ Kristina Mladenovic (FRA) vs.  Bethanie Mattek-Sands / Lucie Safarova (USA/CZE)  Martina Hingis/ Sania Mirza (SUI/IND) vs  Ekaterina Makarova/ Elena Vesnina (RUS)
SOURCE OF IMAGES: Creative Commons