This chart is an example of a chord diagram, which shows the results of the top 10 ATP players (men’s tennis) against each other during 2015. A chord diagram is a suitable graph for illustrating the size of pair-wise relationships between elements in a set.
This graphic is best viewed on a PC or laptop.
Thanks to Mike Bostock, creator of D3, for sample code. Data sourced from tennis-data.co.uk.