The 28-year-old will rise to No. 11 after wining the Qatar Open.
The Spaniard beat Carlos Berlocq, 7-6 (7), 6-2 on Saturday to advance to the final.
The 34-year-old reached the semis in Doha, falling to Victoria Azarenka.
The German revealed the split on Facebook and has yet to name a new coach.
Gael Monfils will now likely play the tie against Germany, March 6-8.
The Dubai semifinals did not belong to Borna Coric. But will the future?
Pioneers Billie Jean King, Gladys Heldman, and the rest of the Houston 9 laid the groundwork for the WTA.
Four years after a setback, 34-year-old Venus Williams continues to turn back the clock.
The best may be yet to come for eight-time major champ Novak Djokovic.