Glasgow-born Andrew Mullen broke his European record to send out a signal of intent in the opening session of the Glasgow 2015 IPC Swimming World Championships at Tollcross.
The 18-year old, who trains at the National Performance Centre in Manchester, lowered his own S5 50m Backstroke marker as he won his heat in 37.29 to claim lane four for tonight’s final.
Brazil’s Daniel Dias, who has won the past two World and Paralympic titles in this event, was second fastest through to the final and the only swimmer within two seconds of Mullen as he won his heat in 37.41.
City of Sheffield's James Crisp began his sixth IPC Swimming World Championship campaign with a season’s best to lead qualifiers in his favourite S9 100m Backstroke.
The 32-year old has never finished outside the medals in this event at the past five Worlds and he looks set to continue that record after booking lane four for tonight’s final with a 1:04.43 effort. Australia’s Brenden Hall was next best from the heats as he qualified second fastest on 1:05.04.
Four-time Paralympic medallist Ellie Simmonds closed in on her first medal of the meet as she qualified fastest for the S6 400m Freestyle final.
The 20-year old National Performance Centre swimmer has won the past two World and Paralympic titles and booked lane four for tonight's final in 5:25.97 with Ukraine's Yelyzaveta Mereshko second fastest in 5:28.18.
European silver medallist Scott Quin won his heat in Glasgow as he qualified second fastest for the SB14 100m Breaststroke final.
The Warrender swimmer touched in 1:07.98 to progress behind the Netherland’s defending champion Marc Evers in 1:07.53.
Boldmere's Tully Kearney lowered her PB as she progressed second fastest in the S9 100m Backstroke.
The 18-year old clocked 1:11.17 to qualify behind Australia’s Ellie Cole, who set the first world record of the Championships with a 1:08.89 swim.
Beckenham swimmer Susie Rodgers was also second fastest through in her event on the opening morning as she finished second in her S7 100m Freestyle heat in 1:13.62 with USA’s defending champion Cortney Jordan taking the touch in 1:13.17.
Competing in her first event at her debut World Championships, 16-year old Alice Tai broke her own British record to place 10th in the S10 50m Freestyle.
The Bournemouth Collegiate School swimmer sliced 0.01 seconds off her old marker as she touched sixth in her heat in 29.60 and only missed out on a final berth by 0.16 seconds as Spain’s Isabel Hernandez Santos claimed the eighth qualification spot in 29.44.