By way of an "anti trend" example, consider Hawkesbury 04 from yesterday:

Favourite: Moneylegs $2.80 Last 4: 1 3 4 2...came 2nd (as you would expect)
Worst Rank: Serendipity $10.50 Last 4: 0 8 1 9...came 1st!(what was it about that 2nd last race, that it won, compared to poor performances in races each side of that win? Are the conditions today matching the conditions of that 2nd last race?