A lot of excited was generated in the fifth hour of racing, as the Corvette Racing car being driven by Germany's Mike Rockenfeller was reeled in by the chasing pack of Serra, another Porsche GT team with driver Laurens Vanthoor (Belgium) and then Bamber.
They ran nose to tail for multiple laps, with Bamber coming out fourth after they all went in for a pit stop.
At one point, Bamber's team was up to second, but with five hours remaining in the race in the early hours of the morning at Le Mans, they were hovering in the third to fourth GTE standings, as Serra's crew had gone up to the lead, while Rockenfeller and Vanthoor's team fell back off the pace.
Fellow Kiwi and IndyCar standout Scott Dixon came sixth for GTE in the Chip Ganassi Ford with American co-drivers Ryan Briscoe and Richard Westbrook.
Ultimately, the Top 5 GTE cars occupied 20th to 24th on the overall placings.
Bamber's busy northern hemisphere season continues as he now heads to Germany for the Nurburgring 24 Hour race, then a week later he travels back to the United States for the next round of the IMSA championship at Watkins Glen.
Alonso's Le Mans overall victory will be his last in the World Endurance Championship for Toyota, as he is being replaced for next season by Bamber's fellow Kiwi, friend and 2017 Le Mans co-winner Brendon Hartley.