Pablo Andujar overturned the odds to beat fellow Spaniard David Ferrer and reach the final of the Barcelona Open.
Guillermo Garcia-Lopez came from a set down to beat Gael Monfils and reach the final in Bucharest.
Caroline Wozniacki held her nerve against Simona Halep to reach the final of the Porsche Tennis Grand Prix in Stuttgart.
Kei Nishikori is two wins away from defending his title at the Barcelona Open after claiming his place in the final four.
Simona Halep continued her winning habit in 2015 as she saw off Sara Errani to reach the semi-finals in Stuttgart.
Gilles Simon's bid for a fourth title in Bucharest came crashing down after being beaten by Spain's Daniel Gimeno-Traver.
Martina Navratilova has ended her coaching link-up with Agnieszka Radwanska after just five months.
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Three-time defending champion Maria Sharapova was knocked out of the 2015 Porsche Tennis Grand Prix on Thursday.
Rafael Nadal's bid for a ninth Barcelona Open title ended in third-round defeat at the hands of Italy's Fabio Fognini.