Norris Leads Piastri in Sao Paulo Practice Session
The British driver has outscored his teammate at each of the last five race weekends.
The McLaren driver narrowly beat fellow driver and title rival the Australian for the top spot in the dying seconds of the practice session at the Brazilian Grand Prix.
Norris, who grabbed the points lead from his teammate by just one point after winning in Mexico City a fortnight back, topped the Australian by a mere 0.023s.
Before then, Oscar Piastri had been the fastest McLaren driver for most of the session before sprint qualifying set to begin at 18:30 GMT.
The Red Bull star, the sole remaining contender in realistic title contention, lying 36 points behind behind Norris, finished in 17th position as his team followed a alternative strategy.
Verstappen's team-mate the Japanese driver was the only driver to go off, if briefly, when he lost control at the fourth corner during the early running.
Tsunoda spun out over the curbs on exit before rotating through the escape zone, and was fortunate to escape with just a minor contact of the wall.
Ferrari's Lewis Hamilton also lost it, at the final moments of the session, rotating twice through the quick descending corner approaching the final corner on to the pit straight.
Hamilton finished practice in 19th, one place behind team-mate Charles Leclerc.
Norris and Piastri were well clear of the rest of the field, with Nico Hulkenberg's Sauber third fastest, 0.619 seconds off Piastri's best.
Aston Martin's Fernando Alonso was fourth quickest, with Sauber's Gabriel Bortoleto fifth from Mercedes' George Russell and Alpine's Pierre Gasly and the Williams of Carlos Sainz.