London, Sept. 22 -- Gabriel Martinelli rescued Arsenal as the Brazilian's last-gasp equaliser salvaged a 1-1 draw against Manchester City on Sunday when Pep Guardiola's defensive tactics backfired at the Emirates Stadium. With City clinging to the lead given to them by Erling Haaland early in the first half, Guardiola made a series of unusually cautious substitutions that left his side without a recognised striker on the pitch in the closing stages. It was the kind of rearguard action that is rarely associated with the attack-minded Guardiola, but his willingness to sacrifice his purist principles for a more pragmatic approach came back to haunt him. It was a change made by Arsenal manager Mikel Arteta that proved decisive as Martinelli cam...