Whose March breakthrough was the most impressive?
Kei Nishikori (defeated Roger Federer, David Ferrer in Miami)
Alexandr Dolgopolov (defeated Rafael Nadal, Stanislas Wawrinka in Indian Wells, Miami)
Dominika Cibulkova reaches top 10 for the first time
Flavia Pennetta (defeated Li Na, Agnieszka Radwanska in Indian Wells)