Hales hit a superb 222 not out on day one of Nottinghamshire’s County Championship match against defending champions Yorkshire to leave Notts 393/7.
Hales said: “It’s a very proud day for me to make that score against the County Champions and against a very good attack.
“I’m very pleased with how the day has gone, it has been one of those days where all the shots I’ve tried have come off.
“They bowled pretty well at me in the morning session but I knew if I got through it, it would become easier and I’d be alright”
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“I hope to show that I can make scores in all three formats. This year I want to make as many big scores as I can in this format because it’s still my dream to play Test cricket.”
The England one-day batsman struck a six and 37 fours in a superlative 250-ball innings to record the highest score of his first-class career.