Dominic is a nice humble young men that works hard but I feel his game has limitations to compete against these top guys Roger,Novak and Rafa to bring the best day in and day out.He stays too far back so right away he was playing into Rafa's strength, yes he can win some matches like the one against Andy but it's hard when you stay too far back and cann't put away a ball that lands little short.
I also think Dominic has a great backhand and very good serve but his forehand is probably the weaker (relative to his strengths and other forehands on tour before someone attacks me

) part of his game but again everyone has one wing that's not so great.In mens game strong forehand goes a long way as most of the time (60 to 70%) they are hitting forehands.Some of these guys have good forehands and not great forehands which shows up in big finals where great forehand under pressure goes a long way to make the difference considering the margins are so small.
Roger and Rafa built their games around those great forehands ( 31 grandslams together...great straight arm forehands).I always felt Murray had everything but his forehand isn't at the level of Roger,Rafa,Delpo,Sampras or Gonzalez which really hurt him in many grandslam finals.Novak is probably the one who is good at both wings even if his forehand is not at these guys level but very close since he takes the ball early and stays close to base line.
I really love to see young guys coming through as Tennis needs new faces even though I love all these great older championions.Good news is Dominic will only get better and I thought he hit his forehand great in Murray's match.Zverev is a another great potential with strong mental game.Kyrgios is one guy that has everything and stays close to baseline and has the tools to take out these guys.