Janko Tipsarevic extends his winning run to 2 matches with win over Janko Tipsarevic . World No . 2 qualifies for semifinals at ATP 's season-ending event for 10th time . He ends Paris and Valencia champion David Ferrer 's 11-match unbeaten run . Spaniard must now beat David Ferrer to have chance of going through .
Roger Federer extends his winning run to 12 matches with win over David Ferrer . World No . 2 qualifies for semifinals at ATP 's season-ending event for 10th time . He ends Paris and Valencia champion Ferrer 's 11-match unbeaten run . Spaniard must now beat Janko Tipsarevic to have chance of going through .