Federer had initially planned to play only in Madrid before Roland Garros.
The 20-time Grand Slam victor has not played on the red clay in the Foro Italico since 2015 when he finished runner-up for the fourth time, losing to Novak Djokovic in the final. So that helped because I remember years ago - or years ago - three or four years ago, when I was practising it was snowing, like this weekend in Switzerland, and that didn't inspire me very much to go, you know, go practice on clay, or go into an indoor bubble and stuff, so that - this year was easy.
However the dual ATP-WTA clay showpiece will restart at 10am (0800 GMT) on Thursday, after a frustrating day that saw starting times regularly delayed until play was officially abandoned at 8pm (1800 GMT).
Federer added: "I just really hope it doesn't take away the fact I'm really happy to be here. It's announcing to be a very exciting season, even a more complicated one for the top guys next year, I believe, because this is the year where they truly are breaking through, truly are gaining a lot of experience".
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Federer could come up against eight-time champion Rafael Nadal in the semi-finals in Rome, and Madrid Open victor and eighth seed Stefanos Tsitsipas in the quarter-finals. "I'm happy to see that it is the way it is, to be quite honest". I mean, my excitement couldn't be bigger.
Meanwhile, former French Open victor Garbine Muguruza warmed up for Roland Garros by easing into the second round yesterday morning (Singapore time) with a straight-set win over China's Zheng Saisai.
After play was suspended for more than an hour, Azarenka eliminated her opponent to win 4-6, 6-1, 7-5.