What's he doing hanging out with the US DC team, is he very highly rated by the USTA or something, same with Kudla, were they the hitting partners, seems odd that they would get the nod over Harrison, Sock, possibly Johnson and Klahn?
Hitting partner along with Kudla and Johnson (Johnson is in the picture). Sock still not fit coming off a long lay-off (surgery). Despite his success at the Open, it was better for him to train and prepare for the challengers in the States. Harrison had plenty of opportunities and will only play if they need him on the main squad. Krajicek, Kudla, and Johnson served on the practice squad before and were signed up for tournaments in Europe during that time span. Klahn will get his chance if he hadn't already; they generally nominate new practice partners for every tie (part of the initiative to expose young players to the Davis Cup). Krajicek was a pretty successful junior before he went to college (National Champ). Turned pro this year (I think) and he had good results earlier this year, but he is kinda in a slump right now.