I see heat 3 going pretty fast as they have Fernandez and Webb who don't mind leading at a fast pace and wouldn't want to risk a tactical sprint for the top two.
You'll get at least 4 maybe 6 making the final from that heat.
That puts Lomong and Lukezic at risk in the same heat trying to get top 2. One of those two might not make it to the final.
I see Manzano doing whatever it takes to win his heat and make it through. His heat will know what time they need to get in and he can just react.
Heat one is pretty wide open. Myers has the best PR and is known for timing his kick so he should make it through.