On Monday, Milos Raonic will be the No. 4 player in the world

Even though he's about to have surgery on his right foot, an unexpected and unwelcome development that puts his participation in the upcoming French Open in doubt because of the tight frame, Milos Raonic did get a piece of good news Sunday.

With Rafael Nadal's loss in the Madrid final, and his drop to No. 7 (!!!!) in the ATP Tour rankings, Raonic will rise to a career best No. 4 when the new list comes out in Monday.

Unfortunately, it's only for a week.

It's one of those momentary quirks in the ranking system, just as when Genie Bouchard rose to No. 6 a few weeks ago even though she didn't even play the tournament in Stuttgart - all because Ana Ivanovic was an early-round casualty.

Still, No. 4 is No. 4, no matter how long it lasts.

Raonic reached the semi-finals in Rome a year ago and with the 52-week rolling ranking system, those 360 points will drop off the computer at the end of the Italian Open, with Raonic unable to defend them because of his foot issue.

Where will he be in a week? Again, the 24-year-old Canadian is at the mercy of other players' results.

Both Tomas Berdych and Kei Nishikori will jump back over him as soon as they play in Rome. If Nadal (who is out of the top five for the first time in just over a decade and is a defending finalist in Rome) wins or reaches the final, he would also pass Raonic. If David Ferrer managed to win the tournament, he, too, would pass the Canadian.

Theoretically, then, Raonic could end up as low as No. 8 when they wrap it up on Sunday.

But for now, he's top-four.

Raonic acknowledged it with an Instagram post on Monday.