Is there any industry norms for the short term contract Berian apparently signed with Nike? Are upfront bonuses standard? Do sponsors right in liquidated damages for breach. Have courts enforced those sort of liquidated damages or have they tossed them out as an unnecessary "adhesion clause"?
The most likely scenario I can imagine is Nike gave Berian an upfront bonus when he signed but contract said they could recover all or part of bonus if Berian breaches contract before end of contract. Berian breached before end of contract and Nike attempted to recover bonus but Berian refused and now Nike has sued him to recover bonus. If this is the case then Nike has a pretty solid claim but serving him at a track meet is unnecessary and a pretty dick move. I find it hard to believe that they couldn't locate him somewhere else. I've been served before and they definitely didn't do it at my workplace.
Also, as Berian does have an agent there is no reason they couldn't serve his agent at agent's listed business address and in that case personal service normally isn't necessary on either his agent or Berian. (Again, none of us really know what happened and its possible that both Berian and his agent have been dodging process server but I find that unlikely)
On the other hand Nike might have wrote in some sort of liquidated damages clause where Berian had to reimburse Nike for a large sum of money based on theoretical lost revenue, good will, marketing exposure, etc, etc if he breached, In this case, Nike's claim is a lot shakier and even more of a dick move as one athlete running or not running in Nike gear has almost no effect on their bottom line or marketing potential.