Ashton began playing poker in 2003. Playing under the name "MUSTAFABET", he won a World Championship of Online Poker (WCOOP) event in 2009 in Pot-Limit Omaha for $86,000. His first World Series of Poker cash came in 2011, when he finished in 6th place in the $10,000 H.O.R.S.E. Championship. In 2013, he made 4 WSOP final tables, finishing in 2nd ($5,000 Seven Card Stud Hi-Low Split-8 or Better event #13), 3rd ($2,500 Omaha/Seven Card Stud Hi-Low 8-or Better event #5) and 7th ($2,500 Seven Card Stud event #23) before winning the $50,000 The Poker Players Championship (event #55). By winning this late event, he took over the lead in the WSOP Player of the Year race lead. He is the youngest champion in that event's 8-year history and the first non-American champion. His first three final tables in 2013 were in stud poker variants. His second-place finish in $5,000 Seven Card Stud Hi-Low came to Mike Matusow. His Poker Player's Championship came at a final table that included bracelet winners John Hennigan, David Benyamine, Mike Wattel, and Jonathan Duhamel as well as Minh Ly. The Championship was contested using an eight-game mix that included No Limit Hold’em, Limit Hold’em, Pot Limit Omaha, Omaha Hi-Lo, Seven card Stud, Seven card Stud Hi-Lo, Razz, and Deuce-to-Seven Triple Draw.