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I don't recognize it, but as your garden looks very tidy (so unlike mine)..would suggest you take it out and pot it up-leaving it in the shade to recuperate during out heat spell.
Just looks like it is going to be a larger plant than the ones already there.
Edited..the leaves almost look like elm leaves..
When I looked lactuca up it was lettuce varieties. Is that correct? I have lettuce in my garden, and this doesn't resemble any I've ever seen. Are there other varieties of lactuca? Thanks.
I have those sprouting up in various places in my yard. I'd say weed. When small seedlings, they look like blanket flowers, so I did let mine go for a bit, to about 12" tall. But definately weed.