Mexico's Saul Mendoza lived up to expectations by winning the men's wheelchair race of the London Marathon on his debut in the event.
The 37-year-old, who holds the second fastest time in the world for the 26-mile event, edged Britain's David Weir into second place.
Italy's Francesca Porcellato successfully defended her title in the women's wheelchair race.
The Paralympian finished at the front of a four-strong field in a time of two hours, 05.00 minutes.
Weir was bidding to repeat his 2002 victory but had to settle for his second successive runners-up spot.
Training partner Tushar Patel finished promisingly in fourth place.
Britain's Paula Craig improved on her third place last year to take the women's runners-up spot in 2:07.52.
But the 40-year-old's time was not fast inside to see her qualify for this summer's Paralympic Games in Athens.