pit stop strategies – the Williams team were planning a one-stop strategy whereas the Ferrari team were planning for two stops because Ferrari were concerned over their brakes overheating. Barrichello (on a lighter fuel load) was able to quickly extend his lead over Montoya to ten seconds by his first pit stop on lap 19. However, Barrichello's pit stop proved problematic: his refuelling rig failed to work after it had been re-programmed and Ferrari mechanics switched to his teammate's refuelling rig, keeping Barrichello stationary for around six to seven seconds longer than planned. Barrichello exited the pit lane in third, ahead of teammate Michael Schumacher. Häkkinen lost second on lap 19 before retiring at the Rettifilio chicane two laps later after losing all gears. Although he received signals from the pit lane to preserve his brakes, Verstappen retired on the 26th lap with a loss of power. At the front of the field, Ralf Schumacher moved into the race lead when Montoya made his pit stop on lap 28, where his pit crew made an adjustment to his front wing but had excess oversteer at the race's conclusion. Montoya rejoined in third behind Barrichello with a deficit of 5.5 seconds. Frentzen drove onto the grass to retire from ninth with a gearbox failure on lap 30. Villeneuve made a pit stop from sixth on lap 34 and retained the position. Ralf Schumacher set a series of quick laps to open up a gap of 6.1 seconds over Barrichello by his one and only pit stop on lap 35 and rejoined in fourth. De La Rosa was the last one-stop driver to pit on lap 36 from fifth, which he maintained upon rejoining the track. Michael Schumacher made his second pit stop for fuel on lap 40, and dropped to fourth behind Ralf Schumacher. Montoya returned to the lead when Barrichello made a pit stop for fuel on lap 41. Barrichello rejoined in third, right behind Ralf Schumacher. At the completion of lap 42, with the scheduled pit stops completed, the race order was Montoya, Ralf Schumacher, Barrichello, Michael Schumacher, De La Rosa and Villeneuve. Barrichello lapped faster than Ralf Schumacher and he closed up to the latter. He slipstreamed Schumacher on the start/finish straight into the Retfillo chicane at the beginning of lap 47, and braked later than Schumacher at the end of the straight. Schumacher out-braked himself and drove