Congrats Serena on number 19th.

Serena is now the stand alone 2nd most grand slam titles in the open era with 19.  Steffi Graf still is 1st with 22 grand slam titles. Here are the 19 grand slam Serena won.

 US Open 1999

 French Open 2002

 Wimbledon 2002

US Open 2002

 Australian Open 2003

 Wimbledon 2003

 Australian Open 2005

 Australian Open 2007

 US Open 2008

 Australian Open 2009

Wimbledon 2009

Australian Open 2010

Wimbledon 2010

Wimbledon 2012

 US Open 2012

 French Open 2013

 US Open 2013

US Open 2014

Australian Open 2015