Plotting time splits for multiple competitors

I have a spreadsheet that includes time splits (H:MM:SS) at which multiple competitors passed a series of control points. I would like to plot all the competitors using the control points as the X axis (a simple series - 1, 2, 3, …) and the SAME Y axis for all competitors showing their time split at each control.
When I tried to do this, I got a series of graphs of the competitors, but they were not overlaid using a common Y axis. Each competitor was laid higher on the Y axis over the previous one and the Y axis values seemed to reset to zero for each competitor. This led me to believe that Plotly did not view the values as time, but rather some meaningless category.
Can anyone provide some guidance on how to accomplish this in Plotly?
Thank you.