After three tournament winners in the last three weeks, Andy Schooler is backing David Ferrer and Gilles Simon.
Novak Djokovic became the first player to win the opening three ATP Masters 1000 events by beating Tomas Berdych in Monte Carlo.
Czech Republic will take on Russia in the final of the Fed Cup after both countries wrapped up semi-final victories.
Reigning champions Czech Republic are within touching distance of a fourth Fed Cup final in five years.
Teliana Pereira scored a surprise straight sets victory over number one seed Elina Svitolina in the Claro Open.
Elina Svitolina battled back to defeat Irina Falconi and move into the semi-finals of the Claro Open Colsanita.
Novak Djokovic powered into the semi-finals of the Monte Carlo Masters with a dominant win over Marin Cilic.
Laura Robson is in the field for next month's French Open, raising hopes that she will soon return to the tennis tour.
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Rafael Nadal has announced he will play in this year's new grasscourt tournament in Stuttgart.