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Roger Federer has won two indoor titles over the past 12 months and leads the FedEx ATP Performance Zone.

FedEx Performance Zone: Incredible Indoors

Looking at the best indoor records over the past 52 weeks according to the FedEx ATP Performance Index

In controlled conditions, there are no variables like the sun or the wind. The way a player competes is down to speed of thought as tennis balls often bounce lower and generally skid through the court. It all means that players are forced to be aggressive in their shot selection, match tactics and generally return exceptionally well.

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Roger Federer, who made an historic return to No. 1 in the ATP Rankings en route to capturing the ABN AMRO World Tennis Tournament title, is pre-eminent indoors. The Swiss superstar is 13-1 in indoor play over the past 12 months, with a .929 winning percentage to lead the FedEx ATP Win-Loss category. Overall, Federer has a 277-65 match record indoors with 24 trophies.

Juan Martin del Potro, who has risen back into the Top 10 of the ATP Rankings, is in second position over the past 52 weeks with a 10-2 record indoors (.833). The Argentine is 98-40 overall, with seven of his 20 crowns coming indoors.

Richard Gasquet, with a 7-4 record in indoor finals, admitted to ATPWorldTour.com, “Hitting the ball cleanly is essential to playing well indoors. Of course, it’s faster than outdoors and not windy, so everybody can play better indoors. It’s important to serve well. The serve is the main key on indoor courts.”

Steve Johnson told ATPWorldTour.com, “Any time you have different variables — cool and hot conditions, sun or wind — it can sometimes be an equaliser. But a lot of the time, when the conditions are perfect, the better player wins more often than not.”

Grigor Dimitrov, who went unbeaten (5-0) at the 2017 Nitto ATP Finals, is placed third indoors among current ATP World Tour stars over the past 12 months, with a 13-3 (.813) record.

The month of February features five indoor hard-court events: the Diema Xtra Sofia Open, Open Sud de France in Montpelier, ABN AMRO World Tennis Tournament in Rotterdam, New York Open and the Open 13 Provence.