Listen to this article The eight-time constructors’ champion team has fallen behind Ferrari and Red Bull at the start of the latest ground-effect era as it contends with significant porpoising. For the first time since 2011, it is yet to score a race win or pole position from the opening four rounds. Lewis Hamilton (Bahrain) and Russell (Australia) have chalked a podium apiece but only after unreliability eliminated defending champion Max Verstappen, who was ahead in both events. For the inaugural Miami Grand Prix this weekend, though, Mercedes has introduced a more efficient front wing endplate plus lower downforce, smaller rear and beam wing designs to adapt to the long back straight and high-speed sweeping second sector. These new parts mark its most significant update to the W13 since the minimalist sidepods broke cover for the second pre-season test in Bahrain. Russell has tempered expectation …