Joe Lycett hosts as the nine remaining sewers return to the nation's most famous sewing room for sportswear week. To test the sewers' ability to create practical and stylish sportswear, judges Patrick Grant and Esme Young kick off the pattern challenge with a rugby shirt. The task requires a tricky combination of hard-to-handle stretch fabrics and a fiendishly difficult-to-construct placket. Then, in the transformation challenge, the sewers take cover and turn cagoules into miniature waterproof onesies for toddlers. Finally, the made-to-measure challenge involves tennis outfits. These must be perfectly fitted but allow enough freedom of movement to win a grand slam. Who will smash their way to the top and win garment of the week, and who will score a double fault, becoming the fourth sewer to leave the Great British Sewing Bee?