Junior teams

Alexander represented the United States on the Junior National Team from 2002 to 2003. Alexander, with a number of other Juniors players, was named to the United States "B" team in May 2003 for play in the 2003 US Cup, held at Stanford Cardinal's Avery Aquatic Center.^[11]

The US Cup served as a final tune-up for the 2003 FINA Junior Water Polo World Championships held in August in Naples, Italy, which Alexander was named to.^[12] He led the team with 12 goals^[13] as the US beat Belgium for 11th place.^[14]

Senior team

Alexander joined the full United States men's national water polo team in 2005, appearing in the 2005 ASUA World Championships as well as the 2005 FINA World Championships.^[15]

He continued with the team and played in the 2007 FINA World Championships and 2008 FINA Men's Water Polo World League^[16] in preparation for the 2008 Summer Olympics in London, but was one of the last cut players and ultimately was named as an alternate.^[1][17]

Alexander persevered, setting his sights on the 2012 Summer Olympics. He participated with the senior national team in a number of major competitions including: 2009 FINA Men's Water Polo World League,^[18] 2010 FINA Men's Water Polo World League,^[19] 2011 FINA Men's Water Polo World League,^[20][21] 2009 FINA World Championships,^[22][23] 2011 FINA World Championships,^[24] 2010 FINA Men's Water Polo World Cup,^[19] 2011 Pan American Games,^[25] and the 2012 Pan Pacific Water Polo Championships.^[26]

Despite being a regular on the national team and participating in qualifying for the 2012 FINA Men's Water Polo World League,^[27] Alexander missed out on being named to the Super Final roster. It was a sign of things to come as shortly thereafter he was not named to the 2012 Olympic team^[28] and did not appear in any further major competitions for the team.