There's a bug in the match engine which lets through balls split the central defenders and so creates a 'chance' directly on goal for the striker. To counteract the bug, this kind of chance is exceptionally difficult to score.
Some tactics seem to rely on creating dozens of these type of chances every match - and they will be guaranteed to make you pull your hair out if you don't know that you'll end up missing the vast majority of one-on-ones straight on goal created like this.
You need to create an angle for your striker to have better chances. So having your striker 'moving into channels' (ie the space between where the fullback and centreback) might help, as well as the more obvious PPMs to improve chances of finishing ('takes shot early' is another good one for an accomplished striker).