Alastair Charles Ralphs (born May 22, 1977) is a Canadian professional wrestler and former bodybuilder, better known by his ring name, A-1 (alternatively spelled A1 or A-One).

After spending three years as an undercard talent, Ralphs became A-1, a cocky, arrogant heel, forming an alliance with Johnny Swinger.

He defeated D'Lo Brown for the BCW Heavyweight Championship on December 12, 2004, in Belleville, Michigan at "A Night of Appreciation for Sabu".

On January 23, 2005, at New Year's Revolution, Ralphs interrupted the Hall of Fame induction ceremony, complaining that he was being overshadowed by older wrestlers.

On the November 27 episode of WWE Velocity, A-1 and Rory McAllister lost to Luther Reigns and Mark Jindrak.

at Turning Point (2005), Team Canada (A-1, Bobby Roode, Eric Young and Petey Williams) defeated 3Live Kru and Kip James.

on the Final Resolution (2006) Preshow, Team Canada (A-1, Eric Young and Petey Williams) defeated Jay Lethal, Kenny King, and Lance Hoyt.

on the January 21 episode of Impact, Team Canada (A-1, Petey Williams and Eric Young) defeated Ron Killings, Lance Hoyt and Shark Boy.

On the May 11, 2006, episode of TNA Impact!, Larry Zbyszko asked Team Canada coach Scott D'Amore for assistance in his feud with Raven.

On the June 29, 2006, episode of Impact!, TNA Management Director Jim Cornette disbanded Team Canada.

On October 14, 2017, A1 unsuccessfully challenged Eli Drake for the Impact Global Championship in a match for Border City Wrestling.