ðˈɛn hiː wʌz tɹænsfˈɜːd tə jˌuːnɪˈɑːn ɛspɐnjˈoʊlə, ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti wˈʌn, ɐ klˈʌb wɪð wˌɪtʃ hiː mˌeɪd hɪz deɪbjˈuː ɪnðə fˈɜːst dᵻvˈɪʒən ænd ˌʌndɚ ðə tˈɛknɪkəl dᵻɹˈɛkʃən ʌv nˈɛlsən ˈækɔstə hiː hæd hɪz bˈɛst pɚfˈoːɹmənsᵻz, θˈæŋks tə mɑːɹsˈiːloʊ ðeɪ bɪkˌeɪm tʃˈæmpiənz ʌvðə tʃˈɪli kˈʌp fɔːɹ tˈuː kənsˈɛkjuːtˌɪv jˈɪɹz, ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti tˈuː ænd nˈaɪntiːnhˈʌndɹɪd nˈaɪnti θɹˈiː mɑːɹsˈiːloʊ vˈiːɡə ˈɔːlsoʊ hˈoʊldz ðə ɹˈɛkɚd ʌv wˈɪnɪŋ θɹˈiː kənsˈɛkjuːtˌɪv tʃˈɪli kˈʌps, tˈuː wɪð jˌuːnɪˈɑːn ɛspɐnjˈoʊlə ænd wˈʌn wɪð kˈoʊloʊ kˈoʊloʊ.
Then he was transferred to Unión Española, in 1991, a club with which he made his debut in the First Division and under the technical direction of Nelson Acosta he had his best performances, thanks to Marcelo they became champions of the Chile Cup for two consecutive years, in 1992 and 1993 Marcelo Vega also holds the record of winning 3 consecutive Chile Cups, 2 with Unión Española and 1 with Colo Colo.