Thiem upsets Federer in Stuttgart; Muller to face Mahut for Ricoh Open title

MERCEDES CUP—STUTTGART, GERMANY

Semifinal results:

(3) Dominic Thiem DEFEATS (1) Roger Federer 36 76(7) 64
(7) Philipp Kohlschreiber DEFEATS Juan Martin Del Potro 63 64

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RICOH OPEN—S-HERTOGENBOSCH, NETHERLANDS

Semifinal results:

(7) Gilles Muller DEFEATS (3) Ivo Karlovic 76(5) 76(4)
(8) Nicolas Mahut DEFEATS (5) Sam Querrey 67(5) 64 64