He had a break point for 3-0 as well, that could be a turning point in this set and ultimately the match. Cant see Dan winning this now sadly, I fear he may be gone and 3 sets might be too much today.
Dan was 2-0 30-0* up at the start of the 2nd, then failed to take the second break; then was 40-15 up on his own serve, and got broken back! Wasted quick start to that second set. Is struggling to hold on his next service game too. If he loses this one as well, I'm not giving him much chance of a further recovery from here.