Oscar Piastri stunned McLaren teammate Lando Norris to snatch pole position for the Sao Paulo Grand Prix on Friday evening. Norris had blitzed the field until the final runs of SQ3. Norris set an ominous benchmark on the medium tyres in SQ1, finishing nearly eight-tenths clear of nearest challenger Piastri on a 70-second lap. The Australian narrowed the gap to two-tenths in SQ2 but the shoot-out still looked like a foregone conclusion. Indeed, the title challenger dipped into the 1:08s to take provisional pole after the opening runs. The drivers switched to the faster soft compound for the fin…