It happened in Queens and there were 16 seeds in Madrid.
Basically they think having singles players vs doubles specialists in the first round gains the most attention and this is the best way to ensure that (will not make the blindest bit of difference, imo).
Glasspol and Rojer have had some decent wins this year but haven't been able to take it to the next level. Interestingly this is the first tournament for Reboul and Roger-Vasselin who will team up for the Olympics.