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MAXI J1820+070, a black hole candidate first detected in early March 2018,was observed by XMM-Newton during the outburst rise. In this letter we reporton the spectral and timing analysis of the XMM-Newton X-ray and UV data, aswell as contemporaneous X-ray data from the Swift satellite. The X-ray spectrumis well described by a hard thermal Comptonization continuum. The XMM-NewtonX-ray light curve shows a pronounced dipping interval, and spectral analysisindicates that it is caused by a moderately ionized partial covering absorber.The XMM-Newton/OM U-filter data does not reveal any signs of the 17 hr orbitalmodulation that was seen later on during the outburst decay. The UV/X-ray crosscorrelation function shows a complex shape, with a peak at positive lags ofabout 4 seconds and a pre-cognition dip at negative lags, which is absentduring the X-ray dipping episode. Such shape could arise if the UV emissioncomes partially from synchrotron self-Compton emission near the black hole, aswell as from reprocessing of the X-rays in the colder accretion disc furtherout.

X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070