Federer will make his return to competitive tennis this week when he takes on either Mikhail Youzhny or Mischa Zverev in the round of 16 on Wednesday.
The 36-year-old’s path to the final could see him face young Canadian Denis Shapovalov in the quarter-final and then Nick Kyrgios in the semis.
And should Federer win those three matches, he will become World no 1 for the third time this year.
In February, Federer became the oldest man to top the rankings in tennis history when he reached the semi-finals of the Rotterdam Open.
Federer’s decision to skip the clay court season meant Nadal regained top spot after winning in Monte Carlo and Barcelona.
But the Swiss ace reclaimed the world number one ranking when Nadal was beaten by Dominic Thiem at the Madrid Open.
However, Nadal’s victory at the Italian Open meant he once again returned to the top and his win at the French Open today meant he stayed as number one ahead of Federer’s return to tennis.
Federer can now push for the number one seed at Wimbledon in July if he wins in Stuttgart, then Halle next week.
Yet Federer has a poor record in Stuttgart, winning just twice in his two previous visits.
In 2016, Federer had two match points but was beaten by Thiem in the semi-finals.
And in 2017, the 20-time Grand Slam champion crashed out in his first round to Tommy Haas.
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