NLL Greenhalgh was drafted in the first round (3rd overall) of the
2005 NLL entry draft by the
Philadelphia Wings. He had an impressive rookie season: • Led the Wings in goals (31) • Tied with Dan Marohl for the lead in points (73) but tore a knee ligament before the season began and missed the entire
2008 season (the same season in which the Bandits won the
Champion's Cup). Greenhalgh played six games with the Bandits during the 2010 season. He did not play the entire 2011 season and then retired from professional lacrosse.
MLL Greenhalgh was selected by the
Los Angeles Riptide in the second round (19th overall) in the 2008
MLL Supplemental Draft. He was also named to the Pre-Season Active roster of the
Toronto Nationals for their inaugural season in 2009. ==International career==