it is not a weave, it called cornrows or braids, it is his natural hair. I am not a fan either, he should just go back to the short hair, or if he wants to have the braids, just make them go straight back, no designs.
Technically it is a weave, because he has hair added to it. He wish his hair was that long. Either way he needs a hair cut...do they have barber shops in France? Gasquet often times needs a hair cut as well.
.... I use to think Monfils was ugly. Not anymore. He has the best guns (arms) in the men's game. And when he's finished filling out... he's gonna be a COMPLETE GOD... for me to worship. And leave his hair alone! I like it!
Gaston also sported the exact same hairstyle some time ago. It's not appealing to me, personally. But I think he's not taking it off because he doesn't want to jinx his game. You know how superstitious tennis players can get.