Rafael Nadal gets past Jerzy Janowicz in straight sets on Thursday in Paris. Novak Djokovic joins Nadal in the quarterfinals by coming back from a set down against John Isner.

(1) Rafael Nadal d. (14) Jerzy Janowicz  7-5, 6-4

Nadal ensured that the BNP Paribas Masters quarterfinals would feature all eight of the World Tour Finals participants when he won Thursday’s nightcap over Janowicz in one hour and 43 minutes. The No. 1 seed double-faulted four times and struggled to serve out the match at 5-4 in the third, but he had enough to finish the job in straight sets and improve to 2-0 lifetime against Janowicz.

Both players held en route to 5-5 in the opening set, at which point Nadal finally earned a scalp of his opponent’s serve before closing it out one game later. The Spaniard broke much earlier in the second, right away in fact. This…