James Blake can be regarded as a dominant Puncher. This is by making 30% more points with the forehand that he took his biggest edge against his rivals. The way he returned was also like a Puncher (and not a Tempo player). He accelerated his return with Punch and did not block them in an aggressive way (Tempo).
Puncher / High
The way James Blake Punched was close to his baseline (Tempo). He could also take the ball on the rise on the backhand side but he was more effective when he had a bit more time to load his shots (Puncher).
Tempo / Medium
Winning only 34% of his points by the errors of his rivals (below average), James Blake cannot be regarded as a Retriever at all. He was far too aggressive to count on his rivals' errors to win a match.
Retriever / Low
James Blake was a Puncher/Offensive which means that he followed a great deal of his forehand to the net. His favorite ways to come in was the 1-2 punch approach right after his serve or the baseline approach. He could also mix things up with some serve & volleys.
Offensive / Medium-high
James Blake's ratio of first serve unreturned was above average (40%) but he did not take an edge with his Serve against his rivals. This kind of results occur to aggressive returners who stand close to their baseline for receiving and get more aces/service winners from their rivals. So we can say that James Blake was an effective Server who did not take an edge with this shot.