"For the families staying here, being away from home and family is never easy, but it's particularly difficult at this time of year, so it's wonderful that, thanks to ASB, we can offer this fun afternoon."
Families were also given the opportunity to meet and take photos with the players.
Ronald McDonald House Charities is also the official charity partner of the 2017 ASB Classic.
Isner is the 2010 and 2014 Auckland champion and ranked world No 19. He is the American No 1 and is considered one of the fastest servers in tennis.
David Ferrer has returned to Auckland for the 12th time and holds a world ranking of 21.
He won the tournament in 2007, 2011, 2012 and 2013 and reached the semi-finals in 2016.
The 34-year-old reached a world ranking of three in July 2013.