Opportunity is not a coincidence. When we wish, or wait, for "an opportunity" we may as well be wishing upon a star.
Opportunity (like luck) most often visits those who have prepared themselves, who have invested the "sweat equity" ahead of time, who have worked to build the network, who have done their homework, who have practiced with intention.
Doing all those things doesn't guarantee that opportunity will come our way, but it puts the odds squarely in our favor. More importantly, doing all those things greatly enhances the likelihood of success when opportunity does comes knocking.