Three-time Grand Slam champion to headline field.
Fabio Fognini was the hero for Italy in its 3-1 victory over Japan.
Serena will face two major challenges in comeback says Chrissie Evert.
Novak Djkovic has had a medical "intervention" on his right elbow.
Australian Open boys' champion replaces Melbourne semifinalist in field.
The Williams' family dominance of SW19 could continue for years.
The former World No.1 will play for the first time since Wimbledon.
