I would say it is a seedling Mulberry that just looks viney due to having grown etiolated struggling up through the Lantana.

Yes, mystery plants in hot climates (where white mulberries are present) popping up with maple-shaped leaves are often white mulberry seedlings. Later in life these produce the more familiar leaves of the fruiting sized trees.

Thanks for the help!
That seedling has to go, especially if there's a chance of it growing large. The area is directly over the main sewer line which is already in terrible shape.
I'm glad it was caught before it grew!