But it was del Potro who knocked Djokovic out of the running for the singles title at last year 's Rio Olympics .
Djokovic has a 12 - 4 edge over del Potro , including a win in the most recent tournament in Acapulco .
It was del Potro who knocked Djokovic out of the running for the singles title at last year 's Rio Olympics .
Djokovic has a 12 - 4 edge over del Potro , including a win in the most recent tournament in Acapulco .