My mistake it wasn't Wimbledon but the Australian Open. Other have noticed the same awkwardness I described [1]. Granted DailyMail is not a real journalistic paper, but I include this because it shows the specific moments I found awkward including Serena not thanking him when she won.
About the box. It depends on the player. It's mostly the coaching and training team and some friends and family. Depending on the player and how successful they're. In this specific case, it was mostly trainers, coaches, probably manager, Serena's friends and some family member. So I'm trying to make this about family's not getting along. Serena's coaches, trainers and managers didn't show much connection to Ohanian.
[1] http://www.dailymail.co.uk/news/article-4166476/Serena-Willi...