Legendary Warcraft player Manuel "Grubby" Schenkhuizen gained almost 2,000 MMR after a month and a half since calibrating in Dota 2. Reddit noticed his fast progression, even though Grabby has been playing at fairly low ranks so far.
By the end of September, the Dutch calibrated for ranked and earned 680 MMR. Six weeks later, he is around 2,500 MMR. This is quite an impressive climb, considering how complicated Dota 2 is and that he was streaming while playing it too.
According to Dotabuff, Grubby played almost every day for 6-8 games on average. Roughly estimating, he gained around 44 MMR every day. His winrate in ranked is 61%, best heroes lately are Tidehunter and Clinkz.
Grubby is a former RTS pro player in Warcraft III, StarCraft II, Heroes of the Storm, and Age of Empires 4. During his career, he represented 4Kings, Evil Geniuses, and MeetYourMakers. His achievements are unmatched in WC3, as he has over 38 LAN and six World Championships trophies.